If a person eats hurriedly and barely chews his food before swallowing it, what effect will it likely have on his stomach?

a. his stomach will have to excrete enzymes to digest carbohydrates as well as those to digest protein.
b. his stomach will pass the food directly on to his large intestine without digesting it.
c. his stomach will become infected because there was not time for his saliva to sterilize his food completely.
d. his stomach will take longer to grind the food into chyme than if he had ground it well with his teeth.

i'm conflicted between a and d