Final answer:
The word that can correctly complete the sentence is "interesa".
Step-by-step explanation:
The correct word to complete the sentence is interesa. The sentence should be: "A mí me interesa la clase de ciencias naturales."
The verb interesar means "to interest" in Spanish. When using this verb, we use the pronoun "a mí" to indicate that it is the speaker who is interested.
In this sentence, the verb should agree in number with the noun "la clase de ciencias naturales", which is singular. Therefore, we use the singular form of the verb, interesa.
Learn more about Verbs in Spanish