Which country is the most recent member to join NATO

Which country is the most recent member to join NATO
A: China
B: North Macedonia
C: Belgium
D: Ukraine

North Macedonia became a NATO member in March twenty twenty after completing accession protocols and the name agreement with Greece. China is not part of NATO. Belgium is a founding member from nineteen forty nine. Ukraine has pursued closer ties yet is not listed as the most recent new entrant for the period referenced. Hence North Macedonia is correct.