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Because he could not explain how the continents moved.
its to old
It is to old
there might not be enough proof
the hypothesis has not been proven wrong.
It can be rejected if there is no control variable.
Scientist rejected Wegners hypothesis of continental drift at first because he did not have enogh evidence to support his theory. He failed to provide a suitable mechanism that could cause the continents to move.
Most scientists originally reject the theory of continental drift since it did clearly explain continents would move. This is a theory that has been established by Wegener and did not get good support initially.
Depending on the results of that test, either accept or reject that hypothesis.
because he didn't know how the tectonic plates/continents moved
It means that the experiment is consistent with the hypothesis. It adds to the credibility of the hypothesis.