Need help with finding the right answer. A is incorrect.

Question 15 0/1 pts Pursuant to a contract, Bullish Dozers contracted with Soy Farmers to level several fields to facilitate the growth of crops. Halfway through the leveling, Bullish informed Soy that it was demanding an addition $30,000 because it was overbudget and was needed as the cost of doing business. Soy first agrees, then refuses to pay. The likely outcome would be? Unenforceable because Soy's initial agreement was illusory. Unenforceable because Bullish had a pre-existing duty under the contract. Enforceable as a quasi contract. Enforceable because Soy accepted the offer