12.the maximum number of people to whom an offer can be made at any one time is

:A.one.

B.five.

C.thirty.

D.there is no limit

13.which of the following is most likely to be an offer rather than an invitation treat?

A.products in a confectionary vending machine.

B.an advertisement in a newspaper.

C.a call for tenders.

D.a product for sale on a website.

14.according to the postal rule, which of the following is effective as soon as letter is posted?

A.offer

B.revocation.

C.acceptance

.D.all of the above