Concept:Communism is based on a fair distribution system where citizens contribute by ability and receive according to personal need.
Explanation:The well-known communist principle states: "From each according to ability, to each according to need."
This means every person should work and contribute to society using his or her full capability.
In return, society should provide each individual with the goods and services he or she genuinely requires.
This idea focuses on equality and social welfare, rather than rewarding wealth, status, or personal qualifications.
Therefore, the phrase correctly ends with "ability" for contribution and "need" for distribution.
Among the given options, only option A matches this guiding principle of communism.
Answer:A. ability and to each according to his/her need