Choose your answer from options. Premise: "As a practical matter, mailers are believed in many cases to be able to do this work for a fraction of the cost the postal service would face." If this premise is true, what does that tell us about whether it entails the hypothesis "Mailers are believed to be cheaper than the postal service."?

OPTIONS:
a). yes;
b). it is not possible to tell;
c). no;
a).