The correct answer is C.
Explanation
The model shows a total of 375 made of two parts: 238 and $c$, so the equation is $238 + c = 375$.
Solve for $c$:
$c = 375 – 238 = 137$.
Choices A and B put 375 and 238 on the same side as parts making a larger whole ($c=613$), which doesn’t match the model. Choice D is incorrect algebraically.