Which words in the sentence are the adverb clause?

As she drank her lemonade, Alyssa played a board game with her family.

a. with her family

b. As she drank her lemonade

c. Alyssa played a board game

Adverb clause is a type of a subordinate clause, which means that it cannot exist on its own, it has to be a part of the main independent clause.

Having that in mind, the adverb clause here is as she drank her lemonade.