To complete the sentence, the answer would be the word "gather". Assemble is a synonym for "gather". Assemble means to gather something or someone together. Other synonyms include: build, collect, meet and congregate. The word "assemble" comes from the Latin words "ad-" meaning to and "-simul" meaning together.
Bring to mind, put one in mind of, conjure up, summon, awake
The answer to your questions is D.
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The principal part in which the given verb is formed is option C. past. The action word "chewed" comes from its base word "chew". And to make it into a past form, the suffix -ed is added. The action word "chew" is an example of a regular verb. Regular verbs are verbs that only needs the suffix -ed in order to create a past form of the verb.