If a = 210, B = 0

Multiple Choice

if a = 2.10, b = 0.40, and c = 1, the marginal products of x₁, x₂, and x₃ (in this order) are

A) all decreasing.
B) increasing, decreasing, and constant.
C) decreasing, increasing, and decreasing.
D) all increasing.
E) all increasing if A > 1.