Explanation
"Abstruse" means difficult to understand, so its antonyms include obvious, plain, and lucid—all meaning clear or easily understood. Since each option is a valid antonym, "All of these" is correct.
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"Abstruse" means difficult to understand, so its antonyms include obvious, plain, and lucid—all meaning clear or easily understood. Since each option is a valid antonym, "All of these" is correct.