Is this correct?

"¿Tenías muchos juguetes cuando eras niña?" "No, sólo tenía dos:
a. un dinosaurio y una muñeca
b. un oso y un columpio
c. un pájaro y un tobogán
d. un carrusel y una tortuga

A?

Yes, option A is correct. The question asks if you had many toys when you were a girl, and the answer is "No, I only had two: a dinosaur and a doll." Therefore, option A is the correct choice.