The innermost layer lining the lumen of the alimentary canal is _________ , which forms __________ in the stomach and ___________ in the small intestine. (choose the appropriate option) :

Question

( A ) the mucosa, villi, rugae
( B ) the mucosa, irregular folds (rugae), small finger-like foldings called villi
( C ) the mucosa, irregular folds (villi), small finger-like foldings called rugae
( D ) the mucosa, irregular folds, small finger-like foldings called villi