Answer:
The correct answer is option B. Encanta.
Step-by-step explanation:
This sentence is written in the present simple tense.
This tense is used to describe actions that are usually routines, habits, or something that happens now, at this time.
In this case we have the phrase "Me encanta leer libros de poesía cuando tengo tiempo libre." Of all the options given, you have to see which one is best suited to the unstressed personal pronoun "me", and also be in the present simple, since it is indicating a habit, something that this person does in his spare time.
Next I will write each unstressed personal pronoun with the verb "Encantar" conjugated:
Yo --- Me encanta
Tú--- Te encanta
Él/Ella/Usted--- Le encanta
Nosotros/as--- Nos encanta
Vosotros/as--- Os encanta
Ellos/Ellas/Ustedes---- Les encanta