Unsupported. A problem with superstring theory is the lack of success it has had in explaining the strength of gravity. But this doesn’t mean theorists haven’t tried. They may have tried and failed.

Unsupported. Although superstring theory hasn’t successfully explained the strength of gravity, that doesn’t imply there are other theories that provide better explanations of gravity or other physical phenomena.

Antisupported. We’re told that more established physical theories don’t even attempt to explain the nature and existence of gravity.

Unsupported. The fact superstring theory can’t be tested doesn’t mean it can’t be true. It could still be true, even if we can’t confirm that it’s true.

Strongly supported. We know superstring theory hasn’t been able to explain why gravity isn’t stronger or weaker. That means it hasn’t been able to “account” (explain) for the strength of gravity. We also know this is a “problem.” That means it’s a deficiency in the theory.