Hi! Your answer here is D. environmental factor. Being unable to play tennis due to extreme heat is an example of an environmental factor because the natural heat is preventing you from playing tennis. It is not a cost or equipment factor because it has nothing to do with either category. This is also not a personality factor because, though some people may naturally deal better with heat than others, that's influenced more by their location (example: California vs. Maine) than by their personality.
it jump starts your metabolism and help you burn more calories in the day. It gives nutrients and energy, allowing children to think more clearly and give better results.
Generally, the expressions are used to say that the real worth, success or effectiveness of something can only be determined by putting it to the test by trying or using it, appearances and promises aside - just as the best test of a pudding is to eat it.
