The form of Smetana's "The Moldau" is A. sonata form. B. rondo. C. ternary. D. through-composed

The answer is Option C (Ternary Form)

Bedrich Smetana's "The Moldau", which was originally called "Vltava" mostly has a ternary (ABA) form. T he first theme ("A") is played twice, followed by the second theme, or development ("B") of the piece, we are then brought back to "A", which is played partly through, before being abruptly halted to switch to a developmental minor section.