Digital cameras $199 each.Buy 2: get one half-price!Buy 3: no ch

Digital cameras $199 each.
Buy 2: get one half-price!
Buy 3: no charge for the 4!

Note: Offer ends on 15 May.
Customers receive a free digital camera if they
A、spend a total amount of $199.
B、buy at least three ones.
C、place orders at the end of May
【正确答案】:B