I'd have to cross out B.) and C.), which leaves you with A.) and D.)
I'd have to go with D.) Pitiful
A paragraph can be as long as it has to be. A paragraph is meant to contain an idea. It can be 20 sentences long or it can be 6 sentences long.
Even if you were to define that a paragraph is 6 sentences long, then comes the question, how long should a sentence be? 10 words? Or 25 words? And then comes how many letters the words should be on average. 2 letters per word on average? Or 7?
<span>So how long a paragraph can be is all relative...</span>
D, because the other three are very wide topics but you can explicitly discuss the effects and cause of MLK's bus boycott <span />
Comments that the sky looks blue
So... what's youre question, you gave us the info but...