Question

Yo le doy muchos dulces ________. a mi abuela a mí a ellos a tí

Answer 1

If there is one answer to choose , it's a mi abuela because the question was 
Yo le doy muchos dulces (third person singular)

a ellos = les
a tu = te
a ?  = me ????? not sure to guess what you wrote 

hope I helped !!