hook ('huk) noun [English]

a curved tool for catching, holding, or pulling
something curved or bent
flight of a ball curving to the left
a tool in writing that catches the attention

What is the meaning of the word hook in the sentence below?

Heather used her best hook to get the readers interested.
A.
definition 3
B.
definition 2
C.
definition 4
D.
definition 1