Instruction: Determine the sentiment expressed by the user in her review from the provided choices, and respond by selecting one of the available options.

Input:
I've really enjoyed the first book and am mid-way through the 2nd. This author seems quite profilic (I checked his website). In a way, i'm surprised that i'm enjoying the story line as much as I am. Love the relationship between Jack Nightingale and Jenny.

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