Question

What is meant by Ahura Mazda?
a. This Lord of Light
b. The Lord of Sound
c. The Lord of Soul
d. None of the above

Answer 1

Hint:
 Ahura Mazda is the creator of the universe and all the things in it, being at the same time-wise and good. Via a vision that he had when he was 30 years old, Ahura Mazda was revealed to the prophet Zoroaster / Zarathustra.

Complete step by step solution:
In Persian, Ahura Mazda means the Lord of Light.
The father of Zoroastrianism was Zoroaster of Persia. Zoroaster was tired of seeing his people adoring primitive gods. He revolted against it and declared to the world that there was one god, the Lord of Light, Ahura Mazda.
The Zoroastrians' holy book is Zend Avesta. It is a collection of sacred literature that includes religious hymns, invocations, prayers, confessions, statutes, myths, and sacred reminiscences from various epochs.
Additional information: On a cliff at Naqsh-e Rustam, near Persepolis, Darius I 's summer palace (r. 522–486 BCE), an inscription was made. Here, the creator of the universe is called Ahura Mazda, creating the earth, the sky, and man, and also making Darius the king. The Behistun Inscription, written by Darius I in 516 BCE, is the most significant mention of Ahura Mazda from this time. The inscription accompanies a bas-relief illustrating Darius' triumph over the pretender Gaumata, where Ahura Mazda, portrayed here as a king inside a winged solar disk, stands over the fallen and hovers above them. The inscription's text discusses how Ahura Mazda helped the victor defeat his adversary and that he, Darius, was chosen by the "grace of Ahura Mazda" to lead his kingdom.
Hence, the correct answer is option A.

Note:
Ahura Mazda is the highest spirit worshipped in Zoroastrianism, the old Mede and ancient Persian mythology which spread across Asia predating Christianity.