Answer:
Prefiero leerlas.
Step-by-step explanation:
In this exercise, you have to re write the sentence using the correct direct object pronoun.
Direct object pronouns (''pronombres de objeto directo'' in Spanish) are used to replace a direct object, which is a noun, so you do not have to repeat the noun.
''Leerlas'' is feminine and plural because it replaces ''novelas''.