Henry is kicking the ball.

The correct answer is: He

In the above sentence we will use 'he' because he/she, I/me, they/them, he/him, she/her, we/us, are personal pronouns. Personal pronouns are pronouns that refer to specific individuals and groups. Whenever we want to use a pronouns other than human beings then we use 'it' in that case, for human beings we use 'he/she'. In the above picture, a boy is shown, hence for boys 'he' is used.