Instruction: Assess the user's sentiment in the provided review and select the appropriate sentiment option from the list as the answer.

Input:
Over the years, I have purchase and used many knife sharpeners.  I haven't had good luck with them - "hold the blade at an even 22.5 angle"; or  "apply 3.14 psi of pressure";  and other difficult to perform instructions. Even after following the instructions, my knives were not as sharp as I would have liked them to be.  This sharpener, however, says to run it lightly over the blade several times.  I did.  It worked.  I read about this in Cook's Illustrated magazine - and purchased one immediately.  It is without a doubt the best and easiest knife sharpener I've ever owned.  My knives are amazingly sharp - and a sharp knife is a safe knife.  Friends and family will get one of these in their stockings this Christmas!

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: A: very positive