Which of the following sentences contains an adverbial phrase? a. melissa watched a video about efforts to save endangered polar bears. b. gertrude listened to her best friend lillian in an attentive manner. c. levi earned an academic scholarship to attend princeton university. d. sauntering across the stage, helen accepted her high school diploma.

The sentence which contains an adverbial phrase is B. Gertrude listened to her best friend Lillian in an attentive manner. An adverb phrase, or an adverb clause is meant to modify verbs, adverbs and adjectives. Remember, that it also can include a subject and/or a verb. This part of a sentence can tell you where”, “how”, “why”, or “when.”. In this sentence we have the features of modifying 'how': Gertrude listened to her best friend Lillian (HOW?) - in an attentive manner.