Select the correct option:
The philosopher’s stance was diametrically ________ to the prevailing orthodoxy.

Correct option is D

The correct option to fill in the blank is (d) opposed.
The phrase “diametrically opposed to” is a fixed and idiomatic expression meaning completely or directly opposite. Hence, “opposed” fits perfectly with both grammar and meaning. (Hindi meaning: पूरी तरह विरोधी)
Example: His views are diametrically opposed to mine on this issue.
Explain why other options are incorrect:
· (a) adverse: means harmful/unfavourable; it does not form the idiom “diametrically adverse.” (Hindi: प्रतिकूल/हानिकारक)
· (b) averse: means unwilling/reluctant (“averse to doing”); it describes dislike, not direct opposite stance. (Hindi: अरुचि/विरोधी भावना वाला)
· (c) converse: means opposite/reverse in a general sense, but the correct and standard collocation is diametrically opposed, not “diametrically converse.” (Hindi: विपरीत)