If your conclusion does not agree with (disproves) your hypothesis:
the experiment must be wrong
your hypothesis is right
your hypothesis is probably wrong
your observations or data must be wrong

your hypothesis is probably wrong

Explanation:

A hypothesis is a statement which is based upon assumption of some process or event. The evidences available in the hypothesis are limited. The hypothesis can be proved by the experimental analysis.

If the conclusion of the experimental process does not match with that of hypothesis. This indicates that the hypothesis is wrong as the hypothesis can be true or false it directly dependents upon the experimental results.  

i believe that the answer is c.

when it's short and dry.