Answer:
Dancing is the correct answer.
Step-by-step explanation:
For this question, it is necessary to consider that Frida must do exercise minimizing the chances of injury.
Sit-ups have a strong impact on her abs, increasing the chances of an injury in that area.
Pull-ups can cause injuries in her arms due to the effort she has to do.
Karate is a very physical sport and perhaps the one that exposes Frida to many different injuries.
Finally, dancing allows her to move and control her movements without involving a big risk. Due this it is the correct answer.