Which entity is he this sentence?

Tom asked his son to drive so that he could get experience.

OPTIONS:
- Tom
- his son
his son
Vilket väsen är han denna mening? Tom bad sin son att köra, så att han kunde få erfarenhet. ALTERNATIV: - Tom - hans son
What entity is he this meaning? Tom asked his son to drive so he could gain experience. ALTERNATIVE: - Tom - his son
sonen
son