Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
I was so glad to add more screen trays to my Nesco dehydrator.  These work perfect.  They keep the food from falling through the tray as the food shrinks.  They especially work great when dehydrating berries and small foods.

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