Take out the comma, there is no need for it when there are only two items listed
B. Because if a speaker spoke quickly listeners might have a hard time listening to what they are saying.
<span>Drug addiction is a serious problem that is overcoming the nation and must be taught to avoid its continuation.</span>
He saw the danger, but kept on advancing change.
I think it already is one because there it an independent clause (He saw the danger) and a dependent clause (but kept on advancing change).
The above statement reflects the freedom that the family felt after Gregor died.
Due to Gregor's condition, the family was forced to sell off things and find work to earn money for their daily living. They had to take care of Gregor and they felt trapped by him. They wanted Gregor to leave and free them to live their lives the way they wanted to. When Gregor died, they got their wish. Their disregard of Gregor was evident when the cleaning lady was the one who buried Gregor's remains.
