Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
This book was the perfect blend of mystery and super natural. I highly recommend it.  a real nail biter to the very end.

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