The correct options are
B the wind whispered
C the leaves giggled
Personification is a figure of speech, in which inanimate objects or
abstract ideas are given human-like qualities; they're spoken of as if
they're human beings. For example, "Opportunity knocks at the door but
once", opportunity is an abstract idea that is spoken of as if it has
hands to knock with. In the given sentence, the wind and leaves are
spoken of like human beings that whisper and giggle, hence the phrases
in options B and C present personification and, B and C are correct.
"Wandered into" is a verb phrase made up of a verb and preposition; "he
was" is a phrase made up of a subject and verb. These do not express
personification, hence options A and D are incorrect.