=（）。

单项选择题For any numbers w and z, w·z=w3z(8-w2). If both z and w·z are positive numbers, which of the following could be a value of w ？（）

A. 9
B. 3
C. 0
D.-2
E.-9

单项选择题For real numbers a, b, and c, is ab=bc+3 ？（） (1) ab=3b (2) b+3=c

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.