Question

hypotheses
what should be done if an experiment refutes a hypothesis?
make small adjustments to the hypothesis
keep the hypothesis unchanged
discard the experiment

Explanation:

In the scientific method, if an experiment refutes a hypothesis, it means the hypothesis is not consistent with the observed data. Keeping the hypothesis unchanged is not valid as the evidence contradicts it. Discarding the experiment is also wrong since experiments are based on proper procedures and data - collection. Making small adjustments to the hypothesis to account for the new data is a reasonable step to refine the hypothesis and continue the scientific investigation.

Answer:

make small adjustments to the hypothesis