According to statistics, currently, there are approximately how many drug users living in the United States?

The correct answer is A. 22 million.

According to statistics, approximately 22 million people in the United States are reported to use illegal drugs. This figure encompasses a variety of substances, reflecting the extent of drug use within the population. These statistics are often sourced from national surveys and research studies focusing on substance abuse. If you need more in-depth information or context on this topic, feel free to check the extended services page for further assistance!