In the context of a linguistic study, what is the explanation for the higher rate of apocope of the -s suffix in the verb suffix -mos in the SBO co...

In the context of a linguistic study, what is the explanation for the higher rate of apocope of the -s suffix in the verb suffix -mos in the SBO community compared to other communities?

The higher rate of apocope of the -s suffix in the verb suffix -mos in the SBO community is due to the fact that the suffix is always an unstressed syllable in a polysyllabic word.
The higher rate of apocope of the -s suffix in the verb suffix -mos in the SBO community is due to the fact that the suffix is a verbal suffix.
The higher rate of apocope of the -s suffix in the verb suffix -mos in the SBO community is due to the fact that the suffix is a monomorphemic -s.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) II and III are correct.