Back in the Days When People in Vancouver Sold Houses

Back in the days when people in Vancouver sold houses as houses and not for demolition, Mrs. Reid prepared her house for the market by contracting with Silversteps Ltd. to have her front steps replaced for the sum of $800. Warren, an employee of the company, worked for days framing the stairs and pouring the concrete. Unfortunately, he had done the framing wrong and, in addition, the concrete mix was faulty, so all of his efforts were in vain; the stairs were worthless. On these facts, which of the following is true?

A) Mrs. Reid could successfully sue the manufacturer of the cement for breach of contract because the cement was not fit for its purpose.
B) Mrs. Reid could successfully sue only Silversteps Ltd. for breach of contract.
C) Mrs. Reid could successfully sue both Silversteps Ltd. and Warren for breach of contract because they were both connected with the job.
D) If Silversteps Ltd. failed to pay Warren under the employment contract, Warren could sue Mrs. Reid directly for his pay because he worked on her stairs.
E) Mrs. Reid could successfully sue only Silversteps Ltd. for breach of contract or Warren for breach of contract but not both.