Choose the correct form of the verb to complete the sentence with the past participle
De pequeña, yo
con delfines muchas veces
a. soñábamos
b. había soñado
С. habías soñado

I had looked the translation of it up cause I want to learn Spanish too. this is the english of it.  

"When I was little

with dolphins many times

a. we dreamed

b. I had dreamed

С. you had dreamed"  And your answer is B; English translation"I had dreamed " or Spanish translation "había soñado"