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.

i will say by providing an example of nationalism to explain the idea..

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