Bioflavonoids are
a. synthetic supplements
b. naturally occurring plant chemicals
c. biodegraded chemicals
d. all of the above

In my opinion, the best answer among the choices listed is option B. Bioflavonoids are naturally occurring plant chemicals. From, the name "bio", these substances most likely comes from living organisms. Flavonoids that come from living organisms. Bioflavonoids are found in the rind of green citrus fruits and in rose hips.