Used to select on-screen items. a. sheet tab b. pointer c. button d. folder

B I believe  (sorry if its wrong ♥)

Wouldnt it be a pointer because the pointer is on your screen and if you dont have a pointer to click on your items on the screen what the point on having a computer... So I think its b
Folder doesnt select things it something you open, a button is something you click but you need a pointer to click it and a sheet tab is an open tab from web.

Answer the lady gave a violent start and stared in bewilderment at my companion;

This is very true

cyberstalking on the internet means to harass or stalk someone, a group, or an organization. this may include defamation, slander, and false accusations. in many jurisdictions, cyberstalking is a criminal offense. 

on the other hand, cyberbullying focuses more on intimidating, threatening or harassing someone. harmful bullying include posting threats, rumors, and sexual remarks.