Phil enters into a contract to hire Bob's Building Business to build a warehouse for Phil. The contract specifies that the warehouse should be built with HighQual Bricks. When construction starts, HighQual Bricks cannot provide enough bricks for the warehouse. Bob's Building Business substitutes Big Red Bricks, which are comparable in quality and price to HighQual Bricks. This deviation from the contract
a. discharges Phil from the contract.b. has no effect on the contract.c. increases Bob's Building Business's duties under the contract.d. suspends Bob's Building Business's duty to perform.