Sentence examples for reason could from inspiring English sources

I wonder what the reason could be.

What other possible reason could he have?" Case closed.

One reason could be that it was a hot day.

Then again, the reason could be even simpler.

One reason could be duration.

What kinds of reason could those be?

The reason could be simple.

Only one reason could be selected.

The reason could not be found.

One reason could be the population itself.

One reason could be PAG's confusing organization.