I chose E but struggled between that and the correct answer C. I focused on the idea that she was a "competent mechanic" and therefore her opinion in this scenario was founded however in the second piece of evidence provided it was less clear whether or not she was a competent judge and therefore how could those two be related. However I can see that the two scenarios are not related whatsoever which is why C is correct.

Admin Note: Edited title. Please use the format: "PT#.S#.Q# - brief description of the question."