Which of the following sentences contains an adverbial phrase?

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

Question

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

anonymous · Answer

I think it's the last one...
Gertrude listened to her best friend Lillian in an attentive manner.