The Activity That Is Most Appropriate for a Hospitalized 5-Year-Old

The activity that is most appropriate for a hospitalized 5-year-old who is allowed to go to the playroom is:

A) joining a group of boys and girls who are playing house.
B) looking at a coin collection that belongs to an 8-year-old.
C) playing alone with a racing car.
D) building a block tower next to another child who is also playing with blocks.