The first operating system was developed in

The first operating system emerged in the 1950s; this question tests computer history. GM-NAA I/O was early; other years are incorrect; B is correct. Understanding history enhances technical awareness; this is vital for exams or computing discussions; OS development shaped technology; knowing timelines aids in historical analysis; accurate knowledge ensures clarity in conversations about computer evolution or software; staying informed strengthens computer knowledge; B aligns with the timeline.