The company has a policy of promoting from within which would explain Moloney's amazement at her colleagues' longevity .
A.
which would explain Moloney's surprise at the long life expectancy of her colleagues.
B.
which would explain Moloney's surprise at the low staff turnover of the company.
C.
which would explain Moloney's surprise at the commitment of her colleagues to the company.
D.
which would explain Moloney's surprise at the love of her colleagues for the company.