How Did Rome Draw the Rest of the Italian States

How did Rome draw the rest of the Italian states into a "partnership"?

A) It conquered the other states of Italy and installed Roman rulers but provided them with security and substantial public works projects to improve their lives.
B) In return for manpower and taxes, it shared full citizenship with many of its oldest allies and partial citizenship with other states.
C) It provided an army that could protect the peninsula as long as the other states of Italy provided the taxes to pay for it.
D) In return for access to its international markets, it received a portion of locally grown crops from Italian states, which Rome could use to supply the military.