Which of the following is a sentence fragment?
a. checking his mail each day was always fun.
b. hiding in the tree fort he had built as a kid.
c. realizing you are getting older is sobering.
d. knowing he would be late, she took a nap.

You receive an email from an impressive-sounding stranger, professor alexander rothschild renard iii, president of the american institute for scientific political statesmen. he urges you to vote for his presidential candidate choice. this social media red flag is known as pomposity inanity superstition fanaticism