Based on this article, readers can infer all of the following about professors EXCEPT

a
Professors often receive incorrect written emails from their students.
b
Professors worry about how their students' emails will affect the future.
c
Professors fail students because of students' inability to write correct emails.
d
Professors sometimes make judgments about their students based on the students' emails.

d) the narrator even suggested that the white whale, moby d, was ubiquitous and present in every ocean at every moment.  

the answer is not

answer: dinner and a movie with your friends this saturday night.

opportunity cost refers to the benefits that a person or business misses out on when choosing one alternative over another. opportunity costs are easy to miss, but they can be important for decision-making. in this example, the alternative that the person will miss out on is the opportunity to have dinner and watch a movie with friends on saturday, as he will have no money left after buying the cd.