Final answer:
In this Spanish sentence, the gustar-like verb conjugation is sorprende.
Step-by-step explanation:
¡Les sorprende las películas de horror!
The conjugation of the gustar-like verb sorprender in this sentence is sorprende. In this case, les is the indirect object pronoun, which is used to show to whom the action is done. The subject of the sentence is implied and not mentioned explicitly.
So, the correct sentence is: ¡Les sorprende las películas de horror!
Learn more about Conjugation of gustar-like verbs in Spanish