A parent notices objects that look like soft cucumber or pumpkin seeds in the stool of an infant who has never eaten those vegetables.  What could these objects be?

(a) Proglottids of Taenia solium
(b) Proglottids of Taenia saginata
(c) Proglottids of Dipylidium caninum
(d) Scolices of Hymenolepis diminuta