Select the correct option:
The scientist’s hypothesis was not only radical but also diametrically _____ to the foundational assumptions of her discipline.

Correct option is A

The correct option to fill in the blank is (a) opposed.
Explanation: The fixed phrase is “diametrically opposed to”, meaning completely and directly in conflict with. The sentence shows the hypothesis strongly contradicts the discipline’s foundational assumptions. (Hindi meaning: पूर्णतः विरोधी)
Example: Their views are diametrically opposed to each other.
Why other options are incorrect (with meanings):
· (b) Opposing: present participle (विरोध कर रहा) — does not fit as an adjective after “diametrically.”
· (c) Opposite: different/contrary (विपरीत) — “diametrically opposite” exists, but the standard collocation with to here is most commonly tested as diametrically opposed to.
· (d) Averse: having a strong dislike (विरोधी/अरुचि रखने वाला) — “averse to” is used for dislike, not logical contradiction of assumptions.