Select the most appropriate option to fill in the blank.
And his _____ manner should not be mistaken for a lack of energy.

Correct option is D

The correct option to fill in the blank is (d) diffident.
Explanation: The word “diffident” means shy or lacking self-confidence, which fits the context where appearance is misinterpreted as low energy. (Hindi: संकोची / आत्मविश्वास की कमी)
Example: His diffident manner often made him appear disinterested, even though he was attentive.
Meanings of the other options:
· (a) Daunt – To intimidate or discourage (डराना)
· (b) Debase – To reduce in quality or value (गिरावट लाना)
· (c) Deem – To consider or judge (मानना)