B is the correct answer. A- Biking during all periods of the day can be potentially dangerous, C- It is dangerous to peddle too quickly; you could lose control of the bike,D- continually swithching gears make it dangerous because your wheels will eventually become messed up and potentially dangerous.
<span>A nonspecific (in the way it affects lots of aspects of mind and body) reaction to the demands around us. The higher the demand is perceived by the person the higher the stress.</span>
