Pat agrees to sell her house to Don for $500,000, subject to the...

Pat agrees to sell her house to Don for $500,000, subject to the satisfaction of Don's contractor as to the proper installation of the sunroom that Pat built herself on the back of the house. If Don's contractor does not approve the sunroom, because Don told the contractor to not approve the sunroom:

Question 2 options:

a)

Don's duty to pay for Pat's house will never arise.

b)

The condition requiring the approval of Don's contractor will be excused.

c)

Don's duty to pay for Pat's house will be enforceable.

d)

Both b and c.