Answer:
A) un-enforceable because there is not bargained-for exchange.
Step-by-step explanation:
One of the requisites for constituting a contract is that all the parties involved (in this case Lila and Joanne) must engage in a bargained-for exchange. This means that each party must make a promise or performance in exchange for some performance provided by the other party. In this case, only Lila provided a promise but Joanne didn't provide any.
This can be considered an offer but since Lila cancelled the offer before Joanne accepted it, there is nothing to be enforced.