Which of the following sentences contains an adverbial phrase?

Melissa watched a video about efforts to save endangered polar bears.
Gertrude listened to her best friend Lillian in an attentive manner.
Levi earned an academic scholarship to attend Princeton University.
Sauntering across the stage, Helen accepted her high school diploma.

Question

Which of the following sentences contains an adverbial phrase?

    Melissa watched a video about efforts to save endangered polar bears.
    Gertrude listened to her best friend Lillian in an attentive manner.
    Levi earned an academic scholarship to attend Princeton University.
    Sauntering across the stage, Helen accepted her high school diploma.

anonymous · Answer

Gertrude listened to her best friend Lillian in an attentive manner.