Which statement explains how the law of variable proportions works?
- AAs all factors are increased in proportion, the marginal cost of production increases.
- BAs all factors are increased in proportion, total product rises at a diminishing rate.
- CAs more of a variable factor is added to a fixed factor, the marginal cost of production diminishes.
- DAs more of a variable factor is added to a fixed factor, total product rises at a diminishing rate.