Answer:
D. the Latin word scindere, which meant “to cut, split.”
Explanation:
From the two cognates given "sheath-shed", the words mean different thing individually.
While "Sheath" means "a case for a blade or covering or supporting covers"
"Shed" means "to set apart"
Therefore, the root of the two cognates could be the Latin word "scindere", which meant “to cut, split.”