Answer:
C. The danger his hatred poses to himself
Explanation:
He discovers that he might be suffering from a mental disorder that makes him react with aggression. He suffers later because of his actions, and therefore decides to keep a diary detailing the events and for research.
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A <em>prepositional phrase</em> is a group of words containing a preposition, a noun or pronoun object of the preposition, and any modifiers of the object.

- after
- at
- before
- behind
- by
- during
- for
- from
- in
- of
- over
- past
- to
- under
- up
- with

Attitudes are more often revealed in spoken rather than written language because we use our tone and pitch. If we're mad our tones and pitch differs from being sad and happy.
Your answer will be none of the above