年初剩余的551万农村贫困人口全部脱贫、52个贫困县全部摘帽。

All remaining poor rural residents, totaling 55.1 million in early 2020, were lifted from poverty, as were all of China’s remaining 52 poor counties.
B. All remained poor rural residents, totaling 5.51 million in early 2020, were lifted from poverty, as were all of China’s remaining 52 poor counties.
C. All remaining poor rural residents, totaling 5.51 million in early 2020, were lifted from poverty, as were all of China’s remaining 52 poor counties.