On the first one is D. They don't bother anyone
To 'communicate profound truths'
B. Mrs. Holmes is the best teacher in the entire school.
this is biased because it is inferring one teacher is the best out of the whole school .
The statement said by Franklin D. Roosevelt means that in our perseverance to achieve our dream or goals in life, we should not look upon to the price which is the material benefits, but otherwise, we should be mindful about how we actually like to work and pursue that dream we want.
It's a relative pronoun which introduces a relative clause.