Select the correct option:
Rare though the phenomenon is, it can occur _________ prolonged drought conditions.

Correct option is D

The correct option to fill in the blank is (d) under.
Explanation: We use under with “conditions” to indicate a controlling/prevailing state: under X conditions. Hence, “occur under prolonged drought conditions” is the standard prepositional pairing. (Hindi: … की परिस्थितियों में/के अधीन)
Example: Wildfires often intensify under prolonged drought conditions.
Explain why other options are incorrect:
· (a) towards: in the direction of/with regard to; not used with “conditions” in this sense (Hindi: की ओर/के प्रति)
· (b) amid: in the middle of; suits countable surrounding events (e.g., amid protests), less natural with “conditions” where under is idiomatic (Hindi: के बीच)
· (c) among: in the company of/between members of a group; not used for general “conditions” (Hindi: के बीच/में)