Question $1($Mandatory$)(1$ point$)$

Roberto offered to purchase Jan's laptop computer for $$800\mathrm{.}00.$ Jan said she would think about it and call Roberto in a few days. When can Roberto withdraw his offer?

A$)$ He cannot withdraw it$.$ An offer, once made, is binding.

B$)$ Anytime before or after acceptance.

C$)$ Anytime before acceptance but not afterwards.

D$)$ Anytime after performance of the contract has begun.