Some people might not understand the true meaning of it
Calcium-fortified juices, cereals, breads, rice milk, or almond milk.
Canned fish (sardines, salmon with bones)
Soybeans, soy products (tofu made with calcium sulfate, soy yogurt, tempeh), and some other beans.
Some leafy greens (collard and turnip greens, kale, bok choy)
Diseases, mainly autoimmune, depression, anxiety, a sickness such as a cold or fever, or even just a lack of motivation not linked to depression can be reasons people decrease their physical activity level.
It would be C.
A would not be it because even if you have better roadways they may not help reduce the speed and instead increase it because the teen may like the smooth feeling.
B would not be it because the driver is under the influence. This usually can put the idea of going really fast in the driver's mind because "who would stop them?" and "what's the worst that could happen?"
D would not be it because the teenager may want to compete with the other driver to become victorious which would include in them speeding up.