Select the most appropriate option to fill in the blank.
Her notoriety increased after she single- ________ shot down a Rhodesian army helicopter.

Correct option is A

The correct option to fill in the blank is (a) handedly.
Explanation: The phrase "single-handedly" is an idiomatic expression meaning to do something alone without help. Here, the sentence mentions a woman shooting down a helicopter, which she did on her own — hence "single-handedly."
Grammatical Rule: Compound adverbs such as "single-handedly" describe the manner in which an action is done, and often end in -ly.
Meanings of other options:
· (b) Stranded – (फंसा हुआ) meaning left in a helpless position.
· (c) Dose – (खुराक) an amount of medicine or drug.
· (d) Plainly – (स्पष्ट रूप से) in a simple and clear way.