In the sentence:
My best friend wrote a funny poem about her pet rabbit.
The simple subject is 'friend'. Remember that a simple subject is the main word or words in a subject, so it does not include any of the modifiers that might describe, characterize or restrict the subject (in this case, the possesive 'my' and the adjective 'best')
There are three syllables in contentious: con - ten - tious.
It is an adjective.
It has a Latin origin.
The most common definition is aggressive, controversial, inclined to argue.
The stressed syllable is ten.
The sentence which uses correct punctuation is C. In time, of course, all issues get resolved, but not necessarily in the way you would like.
In A, the comma before <em>he was concerned </em>should be a dash. In B, there should be a colon before <em>a flashlight, </em>not a semi colon. In D, there should be a comma before <em>yet, </em>and not a colon.
