Which tasks are on the critical path?

In Microsoft Office Project Standard 2007, you create the following project plan: You need to identify the critical path. Which tasks are on the critical path?

A.
1, 2, and 3

B.
1, 2, 3, and 5

C.
1, 3, 4, and 5

D.
1, 2, 3, 4, and 5