The correct answer would be traen.......
A. Los aerobicos
The question in English is "The best sport to strengthen the muscles of the shoulders is"
So aerobics is probably your best bet because the other options are yoga, swimming, and the last one I think is athleticism (Not entirely sure)
Answer:
1. How are you? Cómo estás?
3. i broke my ankle- Me he roto el tobillo
4. How did you know that Juan traveled to Puerto Rico?