Constraint A $3 X_{1}+X_{2} \geq 90$ Constraint B $3 X_{1}+2 X_{2} \leq 120$

Multiple Choice

Constraint A: $3 X_{1}+X_{2} \geq 90$ Constraint B: $3 X_{1}+2 X_{2} \leq 120$ Constraint C: $X_{1}-X_{2} \geq 0$
All variables are required to be non-negative. Let the objective function be Max: $X_{1}+X_{2}$ The optimal solution (assuming the first number in parenthesis is $X_{1}$ and the second number in the parenthesis is $X_{2}$ ) will be

A) $(24,24)$
B) $(0,60)$
C) $(20,30)$
D) $(22.5,22.5)$
E) $(0,90)$