Hi, can you please help me with this question?

Suppose that the marginal cost of producing a tonne of wheat is $60, irrespective of the level of output, but there are also some fixed costs of production. Which of the following statements is correct?

a.

The marginal cost curve is a horizontal straight line.

b.

The average cost curve is U-shaped.

c.

The marginal cost curve intersects the average cost curve at its minimum point.

d.

The total cost curve is an upward-sloping straight line through the origin.