The tenth number after the number that is before 10 is 19.
It should be noted that the number that is before 10 is 9.
Therefore, in order to solve the question, we have to add 9 to 10 which will be:
= 9 + 10
= 19
Therefore, the tenth number after the number that is before 10 is 19.
In conclusion, the correct option is C.
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