What does this phrase mean: "there is no substance in these stories"?

[Dieu]

Test No. incompl/elem-4 "Listen/Hear", question 10

I have been ......... strange stories about you recently but I do hope that there is no substance in them.

(a) listened to
(b) listenting to
(c) heard
(d) hearing

Test No. incompl/elem-4 "Listen/Hear", answer 10

I have been hearing strange stories about you recently but I do hope that there is no substance in them.

Correct answer: (d) hearing

Your answer was: incorrect
I have been heard strange stories about you recently but I do hope that there is no substance in them.
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What does "substance" mean?

[Alan]

This means that the stories have no truth in them.
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English as a Second Language
You can read my ESL story A day in the life of a driving instructor