Answer:
they are not effective against viral infections such as a cold or flu.
"Expectancy-value theory". This theory is based upon what a specific person values determines their motivation.
The moat reasonable answer would be D. follow a balanced diet and a moderate exercise plan.
S- Specific
M- Measurable
A- Attainable/Actionable
R- Relevant/Realistic
T- Time-Bound/Timed
The outcome for anyone who is using a S.M.A.R.T goal for their workout should consist of the following. If you follow it appropriately you should meet your goals/standards and even if they aren't met there aren't any consequences assigned with this type of goal.
Honestly this is a great way to keep your priorities in check and plan a way to meet an achievable goal.