is this correct?

"¿Qué hizo Juan después de las clases ayer?" "Creo que él y su novia _____ en bicicleta."
a. montó
b. hicieron
c. montaron
d. tuvo que

C?

assistance needed

Please type the correct subject in the School Subject box. Any other words are likely to delay responses from a teacher who knows that subject well.

Rather than selecting as your screen name, the same as the subject of the post (spanish-spanish/history-history) always post the subject matter - history, Spanish , English , etc. and select a screen name you can always use, no matter what the subject is.

Right. When you don't even understand what it means, look for these things:
1) subject & verb agreement (as in this case)
2) if there is a noun, any and all adjectives that modify it

Sra

Yes, option C is correct.