Tina Said, "If Someone Sees Another Person Helping, the Person

Tina said, "If someone sees another person helping, the person observing the second person helping is more likely to help a new person who needs help." This statement is:

A) a basic argument, because Tina is an authority using data.
B) not an argument, because it is based on poor evidence.
C) a claim, similar to a hypothesis about why people help.
D) a basic argument, because the research (although not mentioned) shows it is true.