Question

expressing class likes & dislikes
how is your
spanish class?
mi clase de química es difícil.
mi clase de matemática es interesante.
mi clase de español es aburrida.

Explanation:

The question is about answering "How is your Spanish class?" So we need to choose the option related to Spanish class. The first option is about chemistry class, the second about math class, and the third "Mi clase de español es aburrida" is about Spanish class (stating the Spanish class is boring), which matches the question's topic.

Answer:

C. Mi clase de español es aburrida. (Assuming the options are labeled A, B, C as the first: A. Mi clase de química es difícil., second: B. Mi clase de matemática es interesante., third: C. Mi clase de español es aburrida.)