Which statement best defines a universal law A. It is in fact some of the time B. It is in effect at all times C. It changes over time D. It operates only under specific times

B would be the answer.

The statement which best defines a universal law is B. it is in effect at all times. A universal law is 'universal' because it cannot be changed and it holds true for every part of the world. Additionally, it is in effect at all times, meaning that it never stops being true. Having this in mind, it is clear that A, C, and D are wrong answers.