Calendar door number 3

The question is:

What has happened to the two arrows?

For today's question you need the following pdf-file:

PiA2015_Experiment_03.pdf

Latest submission time: Thursday 03 December, 2015, 23:00 PM

Unfortunately, a solution for this question can no longer be submitted!

Answer
A) Both arrows continue facing the same direction, but the lower one appears larger.

Answer
B) Both arrows point in the opposite direction and the lower one appears smaller.

Answer
C) The top arrow flips direction, the bottom one remains like the original.

Correct answer Answer
D) The bottom arrow flips direction, the top one remains like the original.