Question

A trio-sonata texture features which three main voices?
A. Two in the alto and one in the bass
B. Two in the soprano and one in the bass
C. One in the alto, one in the soprano, and one in the bass
D. Two in the bass and one in the soprano

Answer 1

That would be two sopranoes and one bass. So the answer is B 

Answer 2

I think the answer may be A