Hint: Hyder Ali and his son Tipu Sultan were the rulers of the kingdom of Mysore in Southern India. They ruled the Malabar region around the eighteenth century.
Complete answer: It is true that Hyder Ali and his son Tipu Sultan were the Mysore sultans who marched to Kerala.
1)The march by the Mysorean rulers was the military invasion of northern Malabar, including the areas of the Zamorin of Cochin, situated south of Malabar, by the ruler Hyder Ali. After conquering it, the Kingdom of Cochin, situated south of Malabar, was renowned as a tributary state of Mysore. The march of Mysore Sultans provided the English East India Company more chances to enhance their control on the ancient feudal principalities of Mysore.
2)Hyder Ali or Hyder Ali Khan who became the ruler of Mysore in 1761, started his career as a foot soldier in the kingdom of Mysore. As a ruler, he managed the rebellious zamindars and improved the condition of farmers. He also modernized the army and defeated the british forces in the first Anglo Mysore war.
Hence, the correct answer is option (A)
Note: After the death of Hyder Ali his son Tipu Sultan, also known as ‘tiger of Mysore’, continued his legacy. He introduced modern weapons in the army and made efforts to create a modern navy. He also realized the importance of trade and industry and tried to bring modernisation and industrialisation in India. He also introduced a new revenue system which started the growth of Mysore silk and other items.