frangipani wrote:

I answered this question in the Bromley forum yesterday. I love these Q's and find them easy.

For those who don't know the answer I've copied my explanation below.

frangipani wrote:

Each shape has at least one line (diagonal) stretching from one corner to another — that rules out A

Each shape has a line inside that creates a set of parallel lines — that rules out D

The other line (i.e not the one that creates parallel lines) inside each shape creates a triangle within the shape — that rules out B

This leaves C as the answer

Not quite - each shape on the left has a line that joins two vertices, and another line that travels parallel to one of the sides.

A does not have a line joining two vertices so it is ruled out

B + D one line does join two vertices, but the other does not run parallel to a side

C is the only picture that satisfies both these conditions