All of the following are considered parts of speech except
adjective.
clause.
conjunction.
preposition.

All are considered parts of speech except clause.

Clause

Explanation:

Parts of speech refer to the different classes of words that exist according to their syntactic functions. In English, the main parts of speech are noun, pronoun, adjective, determiner, verb, adverb, preposition, conjunction, and interjection.

A clause, then, is not a part of speech; it is, instead, a construction containing at least a subject and a verb, and that can express a complete thought (independent) or not (dependent).

  plan: i will begin with a quotation about the importance of unity in a community. then, i will state my claim that an activity will unite our school by creating a shared vision, purpose, and direction. in the body, i will use three main points that describe the different avenues the students can take: through a variety of clubs, through a special event, or through an awareness week. i will provide evidence about other towns that have unity activities and the kinds of events that they include. pictures will illustrate my three main points in action. for the ending, i will restate the main idea in a new way and pose a question to keep the audience thinking. 

if its apex this should be the correct answer

war information to be released publicly must first be deemed useless to the enemy