Keating is all about 'carpe diem', which means 'seize the day, go for it'. He encourages his students to live their lives to the fullest, the way they want to, and not to be restrained by anything. Having this in mind, Knox gathers the courage to go after the girlfriend of a football player, who was way out of his league.
Labor-saving devices are inventions that reduce the time and effort needed to perform or complete a task. Farm equipment, home appliances and construction equipment are examples of mechanical inventions that save time and physical labor.
The answer would be d, because the whole point of the line was for band tryouts to find a new guitarist. I hope this helps.
