What is c=24x+80 r=44x breakeven point

For this case we have the following equations:
 
 The break even point occur when C = R:
 We have then:
 
 Clearing x we have:
 
 Then, substituting in any of the equations we have:
 
 The break even point is:
 (4, 176)
 
 The break even point is:
 (4, 176)

My best guess is b because that's the only reason the coordinates would be on the graph because it's a solution