Germany and Belgium together form the correct answer, as the Netherlands shares its entire land frontier with exactly these two neighbours, a fact confirmed by the CIA World Factbook's boundary description for the country: Germany lies to the east, and Belgium lies to the south, while the country's remaining edge, to the north and west, is North Sea coastline. This makes the Netherlands part of the historically linked 'Low Countries' grouping alongside Belgium and Luxembourg, though it is important to note that the Netherlands itself does not border Luxembourg directly, since Belgium and Germany both lie between them. Option B, Germany and Luxembourg, is incorrect precisely because of this gap: Luxembourg is separated from the Netherlands by a strip of Belgian territory, so no direct Dutch-Luxembourg frontier exists, even though the three countries are often mentioned together as a regional bloc, the Benelux. Option C, Belgium and France, is incorrect because while Belgium is indeed a genuine Dutch neighbour, France does not border the Netherlands at all; Belgium sits between them entirely. Option D, Germany and Denmark, is incorrect because although Germany is a correct neighbour, Denmark lies further north across German territory and shares no frontier with the Netherlands whatsoever. The recurring exam confusion is assuming that regional groupings like Benelux or general northern European proximity imply direct land borders, when only careful map knowledge reveals the true two-country answer. Revision takeaway: the Netherlands borders Germany to the east and Belgium to the south, exactly two countries, with Luxembourg, France, and Denmark all falling outside this direct frontier.