Here Is a Consumption Function: C = C₀ + MPC(Y_d)

Here is a consumption function: C = C₀ + MPC(Y_d) .If C₀ = $300,then we know that

A) if Y_d rises by $1,then Co rises by $1.
B) if Y_d rises by $1,then C rises by $300.
C) as C₀ rises by $15,C rises by $15.
D) as C₀ rises by $15,Y_d rises by $15.