The correct answer is A, WHEN THEY ARRIVED AT THE BEACH.
In English language, an adverb is one of the part of speech. An adverb is a part of speech that talk more or qualifies a verb. It can also be used to qualify an adjective, another adverb or a clause. An adverbial dependent clause refers to an adverbial clause that can not stand alone. In the question given above, the statement given in option A is an adverbial clause, which quality the verb 'arrived'.
The best action for Sabrina to take to improve her speaking skills in the future is A. to take notes on the topic and choose a few ideas to share.
Next time Sabrina should not only research the topic but she should also keep notes so that she doesn't forget all the information she finds. Also, although she could take notes about many different points on the topic she should focus on some of these ideas to share and she should choose these ideas beforehand. Thus, during the discussion she won't be lost as she won't be reading all of her notes during it in order to find which information she wants to share with the group.
I believe the correct answer is B !!
