Select the option that can be used as a one-word substitute for the given group of words.
The study of ancient civilisations and cultures by examining their sites

Correct option is A

The correct one-word for the given group of words is (a) Archaeology.
Archaeology is the scientific study of historic or prehistoric peoples and their cultures by analysis of their artifacts and other physical remains.
Example: She studied archaeology to understand ancient Egyptian civilization.
Meanings of the given other options:
· (b) Entomology: Study of insects.
· (c) Etymology: Study of word origins.
· (d) Arachnology: Study of spiders and related animals.