Question

to return

a
volver
b
entender
c
servir
d
tener

Answer 1

It looks like you're asking for the infinitive forms of Spanish verbs that correspond to the letters A, B, C, and D. Here they are:

a) volver - to return
b) entender - to understand
c) servir - to serve
d) tener - to have

If you need further information or examples about these verbs, feel free to ask!