The correct order of the given hills from west to east is ___________________.
A.Garo -Jaintia- Khasi- Naga
B.Khasi- Garo- Naga- Jaintia
C.Naga – Garo- Khasi- Jaintia
D.Garo- Khasi- Jaintia-Naga

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Hint:The Purvanchal hill range is located in the north east portion of the great Himalayas. It is known as the treasure land of natural vegetation and has multiple small hills housed within. It is situated on the north east side of India and covers multiple states starting from Assam to Manipur. Purvanchal hill range consists of multiple smaller ranges like Khasi hills, Garo hills, Jaintia hills, Naga hills etc. The variation in altitude, climate, and soil type have provided us with a diverse range of forests in the region. Tropical evergreen forests to temperate evergreen forests are present in this mountain range. Hardy winter forests like the coniferous forests are also present in the range.

Complete answer:
The north-east states of India, also known as ‘The seven sisters’ are bordered by a sub-mountain range of the Himalayas known as the Purvanchal range, covering an area of around 95,000 square kilometres, housing a population of over 4 million. Nagaland, Manipur, Tripura and Mizoram, along with a fraction of Assam and Arunachal Pradesh are situated in the valleys of this mountain range., As the name itself suggests, "Purvanchal" is India's eastern border of India, surrounded by Bangladesh in the south-west, Myanmar in the south-east, and China in the north-east. The north-western border of Purvanchal meets the state of Meghalaya and the region where a hill range known as Mikir hills starts. All these are part of the Himalayas.
The main mountain ranges in Purvanchal are Garo hills, Khasi hills, Jaintia hills, and Naga hills. Khasi range is situated in the state of Meghalaya. Southern part of the Tibetan plateau. Brahmaputra river is flowing through these regions. The Khasi hills are located further east and are called the ‘Scotland of the east’ due to its scenic beauty. Jaintia hills are located on the eastern part of Meghalaya. Naga hills are situated in the border of India and Myanmar. From west to east, the mountain ranges are situated in the order Garo – Khasi -Jaintia -Naga hills.

Hence, the correct answer is option (D).

Note:Smaller mountain ranges such as Patkai, Barail, Manipur, Mizoram and Naga Hills are also included in the Purvanchal range. Much of these mountains consist of sedimentary rock, the soil type of these mountains. The ranges are also filled with dense forests. The bulk of Meghalaya's Shillong plateau is also covered by these hills. This mountain range is located in the states of Arunachal Pradesh, Nagaland, Manipur, and Mizoram.