The first one is B because it is just stating the facts
<span>C. In a professional setting, all emails are considered private in nature. The message is intended for the recipient and nobody else unless the receiver has given permission for the data to be disseminated. Mean-spirited messages or those with information that is meant for people outside of the recipient's authority can lead to issues down the road. Messages with abbreviations could lead to an inability to understand the intent of the message.</span>
Ready or eager to fight; pugnacious.
The hyphen should be placed in C) fifty-two.
When you have compound numbers, meaning there are two words to denote a single number, starting from twenty-one, you need to use a hyphen.