Tasha Phones Robert and Asks If She Can Borrow His

Multiple Choice

Tasha phones Robert and asks if she can borrow his vacuum cleaner to clean her apartment before her parents visit.Robert agrees to this.But when Tasha goes to pick up the vacuum,Robert refuses to give it to her.Which of the following statements is true?

A) A bargained-for exchange has occurred,so Robert must loan Tasha the vacuum cleaner.
B) A bargained-for exchange has not occurred,so Robert does not have to loan Tasha the vacuum cleaner.
C) Robert has promised Tasha something of value,so he must loan her the vacuum cleaner.
D) Robert has committed a breach of contract.