Question

shen often has colds. which behavior can shen include in her life to boost her immune system?
quitting smoking
avoiding the sun
drinking more orange soda
sleeping less each night

Explanation:

Quitting smoking is beneficial for the immune system as smoking weakens it. Avoiding the sun too much can lead to vitamin D deficiency (sunlight helps in vitamin D synthesis which is good for immunity). Orange soda has high sugar which can negatively impact immunity. Sleeping less weakens the immune system.

Answer:

quitting smoking