Which of the following statements about the Bohr effect are true?

(A) This is the effect of pH on the binding of O2 to Hb.
(B) As blood travels from lung to tissue, there is a drop in pH, causing Hb to unload more oxygen than if there were no change in pH.
(C) As blood travels from lung to tissue, there is an increase in pH, causing Hb to unload more oxygen than if there were no change in pH.
(D) Myoglobin and Hb exhibit similar pH profiles.

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.