This is an easy question for 6th graders, please help me as I am in need. Please answer both Q14 AND 15, i will thanks you

An object is accelerating at a constant rate. its velocity in feet per second as a function of time in seconds can be modeled by the linear function v(t) = 2.5t. what does the dependent variable represent for this function? a) acceleration b) distance c) slope d) velocity