With everything needed________, she went out of the shop, with her hands full of shopping bags.  [ ]

A. bought          

B. buy                  

C. to buy              

D. buying

下列运算中，正确的是[ ]

A．3a²﹣a²=2          

B．（a²）³=a5              

C．a³a⁶=a⁹          

D．（2a²）²=2a⁴