One reason the United States of America considers Russia an adversary is: D. Russia targeted US citizens in cyberspace.
An adversary can be defined as an individual, group of people, country, or force that are considered to be an opponent or enemy because they plan and execute an attack on another.
Russia is considered to be an adversary by the United States of America because U.S citizens have been attacked in cyberspace by the Russians.
For example, Russia attacked or ha-cked the Presidential election of the United States of America in 2016 by using spear-phishing emails and malware attacks to
gain an authorized access to voter data on her website.
Read more: https://brainly.com/question/24112967
