Many bonded servants never worked off the indenture nor became success

Many bonded servants never worked off the indenture nor became successful. Still, the result of indentured servants’ successes was that:

a. few Englishmen were willing to work so hard
b. most colonial leaders disliked indentured servants
c. slavery became un-economical
d. others were inspired to emigrate as bonded servants

ANSWER
D