Which of the following has a solution set of {x | x = 0}?
A. (x + 1 < -1) ∩ (x + 1 < 1)
B. (x + 1 ≤ 1) ∩ (x + 1 ≥ 1)
C. (x + 1 < 1) ∩ (x + 1 > 1)