In calculating the break-even point for a multi-product company, which of the following assumptions…

In calculating the break-even point for a multi-product company, which of the following assumptions are commonly made?

I. Selling prices are constant.

II. Variable expenses are constant per unit.

III. The sales mix is constant.

A) I and II

B) I and III

C) II and III

D) I, II, and III