Final answer:
Carlos has discovered a talent in running.
Step-by-step explanation:
The correct answer is d) Carlos discovered a talent in running.
In the given statement, Carlos realizes that his ability to run away from his problems has been useful. This suggests that he has discovered a talent for running.
Running away from problems is not generally considered a good strategy and it is not indicated by Carlos' statement. Therefore, option c) is incorrect.
There is no mention of Carlos having slow problems in the statement, so option a) is incorrect.
Option b) is incorrect because Carlos clearly states that running away from his problems was worth something.