Which two words are the closest antonyms?

A. Controversy and Similarity

B. Plagiarism and Forgery

C. Subjective and Substantial

D. Foolproof and Unreliable

(D.) Foolproof and Unreliable

Explanation:

A. Controversy and Similarity:

Controversy: It means usually means prolonged disagreement.

Similarity: It means when something is comparable.

They are neither synonyms nor are they antonyms, they mean nothing alike.

B. Plagiarism and Forgery

Plagiarism: When someone copies something word for word.

Forgery: When you copy something, essentially.

They are synonyms.

C. Subjective and Substantial

Subjective: Essentially means opinionated.

Substantial: Of considerable size/worth.

Not synonyms or antonyms.

D. Foolproof and Unreliable

Foolproof: Reliable, easy to do.

Unreliable: Prone to messing things up.

They are opposites, and therefore, antonyms.