Which one of the following statements is correct?

a.

A consumer is in equilibrium when his or her average utility is at a maximum.

b.

A consumer is in equilibrium when his or her marginal utility is at a maximum.

c.

A consumer is in equilibrium when his or her weighted marginal utility is at a

maximum.

d.

A consumer is in equilibrium when the marginal utilities per rand spent are equal

for all good purchased.

e.

It is possible to compare the utility derived by two individual consumers from the

consumption of a particular good (eg ice cream)