By definition, Resistance Training is another term for exercising your muscles using an opposing force. So, if you'd like <span> to do resistance training at home, the one that would be your best purchase option is the use of hand weights. The correct answer for this would be option D. Hope this answer helps.</span>
Many things can cause shortness of breath, but the most common are asthma, pneumonia, bronchitis, lung cancer, anxiety, an allergic reaction, a lung injury, obesity, heart dysfunction, COPD and many many more things.
As for treating this, see your physician. Hope I helped you!