A sentence with an antonym context clue contains: A. a visual image of an unfamiliar word. B. a familiar word that means the same as an unfamiliar word. O C. an explicit definition of an unfamiliar word. D. a word that's the opposite of the unfamiliar word.​

Here's link to the

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you   can   protest   and   boicot   and   have   marches  

comfortable

explanation:

one type of the adjectives is predicate adjective. a predicate adjective is an adjective which follows a linking verb and modifies or refers back to the main subject of that linking verb.

it usually is used just before the noun it modies.

here in this example:

'penguins seem comfortable in the coolest habitats', comfortable is the predicate adjective which follows the linking verb 'seem' and modifies the noun.