Correct Answer:
B. (B) perfect infinitive tense
The underlined part "to have acted" is a perfect infinitive. It consists of "to" followed by "have" and a past participle, indicating an action completed before the time of the main verb "seems."
The underlined part "to have acted" is a perfect infinitive. It consists of "to" followed by "have" and a past participle, indicating an action completed before the time of the main verb "seems."