Select the word segment that substitutes (replaces) the bracketed word segment correctly and completes the sentence meaningfully. Select the option 'no correction required' if the sentence is correct as given.
(Everyone carefully and methodically were trying to) solve the problem given by the boot camp instructor.

Correct option is D

The correct substitution of the highlighted words is (d) Everyone was carefully and methodically trying to.
Explanation:
The subject “Everyone” is a singular indefinite pronoun, so it requires a singular helping verb, i.e., was, not were.
Also, “was trying” is the past continuous tense, appropriate for an ongoing action in the past.
Grammatical rule used:
Indefinite pronouns like everyone, everybody, each, someone are always singular and take singular verbs.
Example: Everyone was dancing at the party.
Incorrect: Everyone were dancing.
Information booster:
Don't get confused by the meaning of “everyone” implying multiple people; it is grammatically singular.