Which one is an example of an conjunctional phrase?

The correct answer is- গ) He talks as if he were mad.
Conjunctional phrase:
-এই ধরণের Phrase গুলো Conjunction এর কাজ করে থাকে।
-Conjunctional phrase দুটি Sentence বা Clause বা Word কে যুক্ত করে।
-He talks as if he were mad.
-বাক্যটিতে 'as if 'দুটি Clause কে যুক্ত করে conjunction এর মত কাজ করেছে।
-তাই এটি একটি conjunctional Phrase.

Other options:
- Swimming in the river is very dangerous-বাক্যে 'swimming in the river' is an example of Noun phrase.
- He left the village for good- বাক্যে 'for good' is an example of an adverbial phrase.
-We looked for a smart boy- বাক্যে 'looked for' is an example of verb clause.

Source: A Passage To The English Language, S.M. Zakir Hussain.