Question

The topic is defined as the __________.

a. opinion
b. issue
c. main subject
d. thesis statement

Answer 1

Answer: main subject

Step-by-step explanation:

Answer 2

Topic is the major idea about which a text is, but it doesn't have to be controversial or propose an idea, it can even be as simple as "birds"

So another way of defining topic is "main subject" - C.