问题如下：
If a company’s objective is to support its stock price in the event of a market downturn, it would be advised to authorize:
选项：
A.an open market share repurchase plan to be executed over the next five years.
B.a tender offer share repurchase at a fixed price effective in 30 days.
C.a Dutch auction tender offer effective in 30 days.
解释：
A is correct.
Of the three methods, only an authorized open market share repurchase plan allows the company the flexibility to time share repurchases to coincide with share price declines.
C选项错在哪里？？
