Answer:
In The Grapes of Wrath, the sentence that best explains why the man insists on paying for the loaf in the following passage is He has a strict budget and does not want to throw off the amount he allotted for the bread.
Step-by-step explanation:
The man has a big sense of justice and equality he wants to do and asks for what he considers fair he does not want the people to do charity with him since he is willing to pay what he has asked for then as the story advances the people come to realize that he only asked for a dime of bread since that was his programmed budget.