Opportunity cost is:
the value of the best alternative that you give up.
the most desired goods and services that are foregone in order to obtain something else.
what you sacrifice in order to do something.
All of the above are true.

the assumption the narrator makes in this excerpt is that the messages he heards were going to hurt the narrator's mom; the narrator just springs in to action. the narrator doesn't specify in this excerpt why he believes that the messages present a problem that requires protection.

(75years ,i believe is the correct answer.good luck

answer; interviews;

i think the answer to your question is b. directive