Uniter Enterprises wants to repurchase some outstanding shares. Which of the following methods gives them the maximum flexibility and most likely helps to support the price of the shares（）

A. Buying shares back in the open market.

B. Buying back a fixed number of shares at a fixed price.

C. Announcing a tender offer for the desired number of shares.

据统计，青少年吸毒者中许多人起初是出于无知和好奇，认为吸食毒品是一种“时髦”或“享受”，结果陷入其中不能自拔。这告诉我们[ ]

①要坚决抵制毒品的诱惑

②吸毒害人害己，祸国殃民

③要珍惜生命，拒绝毒品

④有一两次吸毒经历不要紧，但千万不可多吸

A．①②④

B．①③④

C．①②③

D．②③④