. As is often said, knowledge is power, and power in the wrong hands can be dangerous. ... If you yourself are faced with an opportunity to gain knowledge and later apply it, you must decide whether the potential benefits are worth any harm that may be done as a result.
B, as there is no point in a comma there. There is already an and in the sentence which is a conjunction.
This is a math question please put it in the math section please
It will be D: <span> It's important to never give up on your dream, no matter how hard the sacrifice and struggle.</span>