Replace the bracketed word with one of the given options, which suitably replaces the word without changing the meaning of the sentence:
The (famous) scientist made groundbreaking discoveries in the field of physics.

The correct answer is (b) renowned.
Explanation:
The word "renowned" means well-known or celebrated, which aligns with the context of a famous scientist. It is the most appropriate replacement for the word "famous."
Meanings of other options:
· Notorious: Famous for something bad.
· Infamous: Well-known for a negative reason.
· Unknown: Not known by many people, the opposite of famous.
Correct sentence:
"The renowned scientist made groundbreaking discoveries in the field of physics."