<p dir="ltr" style="text-align: justify;"><span><span style="">This question is a simple sentence starting with the subject “First-class seats.” What’s missing in the blank is a verb. Thus, (A) "</span><span style="">equipment"</span><span style=""> is wrong since the word “equipment” is a noun, not a verb. </span></span></p><p dir="ltr" style="text-align: justify;"><span><span style="">Based on the meaning of the context, (D)</span><span style=""> "are equipped"</span><span style=""> should be the correct answer because the phrase “be equipped with” is used to express that a person or a place is provided with the things needed for a particular kind of activity or work. </span></span></p><p dir="ltr" style="text-align: justify;"><span><span style="">Example sentence:</span></span></p><p dir="ltr" style="text-align: justify;"><span style="text-align: start;">The auditorium is equipped with state-of-the-art audio-visual equipment</span></p><p dir="ltr" style="text-align: justify;"><span><span style="">(B) "</span><span style="">equipped" </span><span style="">and (C) "</span><span style="">are equipping"</span><span style=""> are incorrect because they both use the verb “equip” in the active voice, with the former in the simple past tense and the latter in the present continuous tense. None of these expressions is illogical since seats can’t actively provide things as humans do. They can only be provided with things for a particular purpose. Besides, when the verb “equip” is used in the active voice, it wouldn’t be followed by a preposition, such as “with”, since it is a transitive verb. </span></span></p>