B. Brent weighs himself each week. One week, he weighs himself twice.
Step-by-step explanation:
A function is a rule that relates the values of one variable quantity to the value of another variable quantity. In a function, there is an input, relation and an output.In A savings relate to time in weeks.In C, number of circuit run relate to time taken in minutes. In D, DVD's received relate to time in months.
