Answer:
habla
Explanation:
the conjugation for present tense on normal -ar verbs is:
yo- o
tu- as
she/he/they (singular)- a
we- amos
they (multiple)- an
Hablar, the original verb is a normal -ar verb so simply take off the -ar ending and replace with its correct conjugation. The subject is "my best friend" so it's singular they ending.