A. We have arranged many meetings and many signatures are collected.
B. Many meetings are arranged, many signature are collected by us.
C. Many meetings were arranged and many signatures were collected by us.
D. Many meetings has arranged and many signatures has collected by us.
Given sentence is in simple past tense and it is in active voice, we need to change it into passive voice.
Rule :
Subject + (was / were) + V3 + Optional Agents.
