Answer:
Reading- Gerund
Step-by-step explanation:
Verbal is a verb which as adjective, nouns or an adverb. there are three types of verbal:
Infinitive
Participle
Gerund
In the above sentence, 'reading' is the verbal gerund. A verbal gerund is a verb which functions as a noun. Hence, when it acts a noun it can be indirect, direct object, subjects, object of a preposition and so forth. Herein, reading act as a noun which acts as a indirect object.