I found the boy reading a book. Here reading is

I found the boy reading a book. Here reading is –

A Present participle

B Gerund

C Noun

D Verb

Correct Answer: Option A

মুল verb এর সাথে ing যুক্ত থাকলে তা present participle form.
read=main verb
reading=present participle
read=past form
read=past participle form