Answer:
A) Quieren entrenarse
Explanation
Espanol:Como 'los deportistas' es plural, significa que es mutiples peronas. B,C, y D son singulares, o solo para una persona. Entonces, la repuesta es A.
English: Since 'los deportistas' is plural, it means multiple people. B,C, and D are singular, or only one person. This means, that the answer is A