Mr. Wilson was planning a pool party next weekend and realized that his pool had not had the leaves removed since the fall.On Monday, Mr. Wilson offered his neighbor Dennis $30 to clean the pool by Friday. Dennis immediately accepted.On Thursday evening Wilson noticed the pool had not been cleaned and asked Dennis if he was going to finish the job on time.Dennis replied that he didn't know how dirty the pool actually was and he couldn't do it for less than $40.Wilson agreed to pay the extra $10 and Dennis cleaned the pool Friday morning.When Dennis came to collect, Wilson paid him $30 and refused to pay the additional $10.If Dennis sues Wilson for the full $40, the likely outcome will be:

Group of answer choices

Dennis will prevail because Wilson voluntarily agreed to the price change

Wilson will prevail because Dennis had a preexisting duty to do the job for $30

Wilson will prevail because Dennis' acceptance of the $30 would be an accord and satisfaction

Dennis will prevail because the additional $10 was a reasonable equitable adjustment given how dirty the pool actually was

Which will be the right answer?