$$Fact Pattern $134$

Sam's Construction, Inc., begins renovating an old ice skating rink for Extreme Skating, Inc., but after three months Sam's$$demands an extra $$150,000.$ Extreme Skating agrees to pay.

Refer to Fact Pattern $134.$If$$Sam$\text{'}$s$$ says it is asking for the extra $$150,000$ because it has encountered extraordinary unforeseen difficulties that will add considerable cost to the project, the agreement is

Question $8$ options:

a$)$

$$enforceable as the consideration is past.

b$)$

$$enforceable because of unforeseen difficulties.

c$)$

$$unenforceable due to the preexisting duty rule.

d$)$

$$unenforceable as an illusory promise.