Which of the following groups of countries are ALL presently U.S. allies in NATO?

The correct choice includes The Netherlands, Norway, Portugal, and the United Kingdom, all of which are member nations of NATO (North Atlantic Treaty Organization). NATO is a military alliance established in 1949 to ensure collective defense against aggression. Member countries are committed to mutual defense in response to an attack on any member state.

The Netherlands, Norway, Portugal, and the United Kingdom have all been integral NATO members, participating in joint exercises, military operations, and contributing to collective security measures. Their longstanding alliances demonstrate a collaborative commitment to the values and strategic objectives of NATO, including democracy and the rule of law.

In contrast, while the other groups contain some NATO members, not all countries listed in those options are part of NATO. For example, Ukraine is recognized as a partner country with aspirations to join NATO but is not a formal member, which disqualifies that group from being entirely composed of U.S. allies within the alliance.