Commercial Renovators Ltd. specializes in retrofitting old buildings for new uses. It has hired Professional Estimators Corporation to provide professional advice as to the processes to remove old equipment such as old boilers and radiators. Commercial Renovators would then hire sub-contractors to complete the removal work. Based on these facts, which one of the following is correct? 

a. The sub-contractors could sue Commercial Estimators in tort successfully.

b. If the missed boiler had to be removed eventually by Commercial's sub-contractors, then a tort action would be successful but only if the missed boiler caused losses for Commercial Renovators.

c. Commercial Renovators must prove only that Professional Estimators was careless. 

d. None of the above is correct.

e. If Professional Estimators forgets to check the sub-basement and therefore misses a boiler, then Commercial Renovators has to prove a breach of standard of care that Professional owed Commercial