Answer the question on the basis of the following cost data.

Output Average Fixed Cost Average Variable Cost
1 $50.00 $100.00
2 25.00 80.00
3 16.67 66.67
4 12.50 65.00
5 10.00 68.00
6 8.37 73.33
7 7.14 80.00
8 6.25 87.50

The marginal cost curve would intersect the average variable cost curve at about: ____________

a. 2 units of output.
b. 4 units of output.
c. 6 units of output.
d. 7 units of output.