I think it is C because A is missing commas, B doesn't need them and D doesn't need one.
I'm pretty sire that the answer is exclamatory
<em>Mitch's brother had a sickness like Morrie's so that is one similarity. Morrie also has a younger brother like Mitch. A contrast is that Morrie knows it is okay to show your emotion ex: crying Mitch however does not......</em>
