1. (10 points) Four lines on a plane divide the plane into eight parts, then at most ( ) of these four lines are parallel.
A. 0
B. 2
C. 3
D. 4
【Analysis】This problem tests everyone's understanding of the division of a plane by straight lines. Since the number of lines given is relatively small, it is simpler to solve it by finding patterns.

【Solution】Solution: This problem asks for the maximum number of parallel lines. There are a total of four lines, so at most 4 lines can be parallel, and in this case, the plane can be divided into at most 5 parts. Now let's consider the case with three lines. If we draw them in the shape of a "田" (a grid), we can get 8 regions, which is valid.

Therefore, the correct choice is: $C$.