Read the following conversation and answer the question.

W: Sometimes when I'm busy, I let my baby watch videos. Can this help his mental development?

M: Passive activity probably won't hurt, but TV and videos are poor substitutes for parents' involvement.

Question: What is good for babies' mental growth according to the man? 

- Watching TV and videos.

- Replacing videos with TV.

- Parents' involvement.


Parents' involvement.