The old gentleman is considering _________he move to New York with his daughter and son-in-law or live alone at home.

A．when

B．how

C．what

D．whether

方程（x+2）（x-3）=0的解是（　　）

A．x₁=2，x₂=-3

B．x₁=-2，x₂=3

C．x₁=-2，x₂=-3

D．x₁=2，x₂=3