An increase in the cost of labour shifts the

1.total, average, and marginal product curves upward andtotal, average, and marginal cost curves upward.

2.total, average, and marginal product curves upward andtotal, average, and marginal cost curves downward.

3.total, average, and marginal product curves downward andtotal, average, and marginal cost curves upward.

A.

1 is correct.

B.

1, 2, and 3 are correct.

C.

2 is correct.

D.

1, 2, and 3 are not correct.

E.

3 is correct.