which of the following function has a chance of being invertible?

a. W(t) = total distance that a person has travelled on foot at time t, where t is the age of this person in minutes.

b. S(t) = total amount of money that a person has spent on Amazon at time t, where t = time in seconds since the beginning of the year.

c. G(t) = amount of glucose present in a person's blood at the time t, measured in minutes since the beginning of the day.

d. suppose that person never spends a day without eating at least a bit of solid food. F(t) = total amount of food in kg that this person has eaten at day t of a given year.