The advertising for a cold remedy claimed that no other cold remedy acted faste an experiment to compare that remedy with another one, it did act faster on average, but the result wasn't significant. what does this mean?

a. the difference was so small that it could have happened by chance even if the remedies were equivalent.
b. the difference was so small that it could have happened by chance even if the remedies weren't equivalent.
c. the probability of the observed difference occurring by chance if the two remedi are equivalent was less than 0.05.
d. the population mean response times are different, but the samples didn't sho