Question

he aspires..........the post of a professor
a about
B for
c to
d on

Answer 1

he aspires for the post of a professor

Answer 2

Answer:

He aspires for the post of a professor.

Here the right option of the given question is B) for.

Therefore, the correct sentence will be as following :

"He aspires for the post of a professor".

You can further have a discussion in your class with your teacher or even discuss in your peer group. Also keep practicing such exercises to brush your grammar skills.