Suppose there are two buyers in a market with the following demand functions

Subject:EconomicsPrice:3.89 Bought7

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Suppose there are two buyers in a market with the following demand functions.

Demand 1: P = 210 - 1.9Q

Demand 2: P = 168 - 0.9Q

Which of the following points is not on the market demand curve?

Select one:

a. P = 112.00, Q = 113.80

b. P = 189.00, Q = 11.05

c. P = 168, Q = 22.11

d. P = 56.00, Q = 193.05

I don't think it's solvable through normal measures, how does this work?