Susan wants to play softball and work after school. she cannot do both, so she decides to play softball. what is her opportunity cost? a. playing softball b. working c. being with her friends d. there is no opportunity cost because she spends no money.

Opportunity cost is what you give up to do something else. Since she decided to play softball after school, she cannot work so the answer is B

For question 1, i'm a bit stuck between serif fonts or large enough type to read. serif fonts are good fonts to use because their easy to read. but you also need your type be large enough to read. if i had to say what you need to consider most important, i would say d is the answer.  for question 3, i believe the answer is d. it seems most appropriate to do that. on every page or every other page would be too much, and only on the contact page just seems inappropriate.  for question 4, it's probably a. by "color scheme" it doesn't mean just one color, but a set of colors. colors that are complimentary to each other. having too many is too distracting so it's best to limit it as much as possible, but not to the point where your website looks dull.hope this !