Which statement correctly compares a law and a theory?
a law provides an explanation, while a theory simply describes observations.
a law is supported by data, while a theory is merely a guess.
neither a law nor a theory can be proved false.
both a law and a theory can be tested

Laws and theories are essential parts of the science and the scientific research.
The law provides description of a natural phenomena (observation), while the theorem provides an explanation ( why the phenomenon exists or what causes it).
From the given statement the following correctly compares a law and a theory:
 Both a law and a theory can be tested.