The answer is B.
A. reach and often develop stronger reactions to food and want more of them.
Issue: Lacks parallelism; "want more of them" is awkward and unclear.
B. reach, often develop stronger reactions to food and want more of it.
Correct Choice: Maintains parallelism; "want more of it" is concise and clearer than "want more of them."
C. reach, often develop stronger reactions to food, wanting more of them.
Issue: Awkward phrasing; lacks parallelism.
D. reach, often developing stronger reactions to food and wanting more of it.
Issue: While maintaining parallelism, "developing" changes the tense and disrupts the parallel structure.
E. reach, often developing stronger reactions to food and want more of it.
Issue: Inconsistent verb forms; lacks parallelism.
In summary, option B stands out as the correct choice because it maintains parallelism and offers clear and concise phrasing with "want more of it," which is preferable over the potentially ambiguous "want more of them" or the tense inconsistency in other options.