Which is usually the main purpose of the first act of play A) To introduce the audience to the characters, setting, and plot
B) To wrap up or resolve the plot after the climax of the play
C)To develop the plot through screens of increasingly complex, drama, action or humor
D) do you shown characters overcoming obstacles on their way to achieve some goal

I think it can be either A or D, but my guess is A

i decided to stay late in the laboratory to continue my experiment with the lightbulb. at midnight, thomas edison opened the door and saw all the stuff he was working on. the lightbulb, film and the transmitter. as he walks in an idea hits him on how the lightbulb would work. he would have to change a few wires around to get it to light up. when he did change the wires around it worked so he decided to write a telegraph to his friend to tell him about his success.   as he was packing up he grabbed the telegraph and walked to his home. he told his wife about the success and the next morning mailed the telegraph.