Select the option that can be used as a one-word substitute for the given group of words.
A study of election trends

Correct option is D

The correct one-word for the given group of words is (d) Psephology.
It is the branch of political science that deals with the study and analysis of elections, voting patterns, and public opinion. (चुनाव रुझानों का अध्ययन)
Example: The psephologist predicted a landslide victory for the ruling party.
Meanings of the given other options:
· (a) Acoustics: The science of sound. (ध्वनि का विज्ञान)
· (b) Philology: The study of language in written historical sources. (भाषा विज्ञान)
· (c) Theology: The study of religion and religious beliefs. (धर्मशास्त्र)