Which of the Following Statements Are Positive

Which of the following statements are positive?
1.The federal government should increase production of biofuels.
2.Air travel has increased since September 11.
3.The greatest number of accidents are caused by drunk drivers.
4.We ought to have a cure for cancer.

A) statements 1 and 4 are positive
B) statements 2 and 3 are positive
C) statements 1 and 2 are positive
D) statements 3 and 4 are positive
E) statements 2 and 4 are positive