It could be to help the environment or they don’t have enough money for another alternative.
The tiny spark set Jen's homework on fire because sparks start fires.
Answer:
It creates uncertainty because the audience cannot be sure if the ghost is actually present, or if Macbeth has simply gone mad.
D. Mrs. Mallard had loved her husband, but she is happy that she is free.
I think this is accurate, and out of the options it looks like the best choice, but I am not certain.
