The correct answer would be "D. She washed the shells and dried themm in the sun.". First, we should know what a <em>compound predicate</em> is. A compound predicate is when a subject has 2 or more verbs. In your sentence, you have two verbs, which are <em>washed</em> and <em>dried.</em>
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C. A manuscript. If only one answer is allowed. A primary source is a document that is created at the time in which the events it describes is occurring. A manuscript is something that is written by hand and therefore the author would be describing events or ideas that occurring at the time of creating the manuscript. A textbook references other ideas and is a secondary source. A fiction book describes unreal events. A journal article is published in a collection and often refers to other previous events.