Which sentence contains a gerund?

a. Playing baseball with his friends, Noah decided he needed a new bat and glove.

b. The number one leader in runs scored for his team is batting first in today's game.

c. Watching little league baseball is a favorite pastime of people who appreciate summer.

d. Some baseball teams are successful because they acquire players reaching for their highest potential.

c. Watching little league baseball is a favorite pastime of people who appreciate summer.

The sentence that contains a gerund is: c. Watching little league baseball is a favorite pastime of people who appreciate summer.

To identify the gerund in the sentence, you should look for a verb form that ends in "-ing" and functions as a noun. In this case, the word "watching" is a gerund. It acts as a noun, as it is the subject of the sentence.