Sentences with many clauses and phrases are difficult to understand because the clauses and phrases typically

change the intended meaning of the sentence

refer to other sentences in the passage

modify other clauses and phrases in the sentence

make it hard to determine where the sentence ends

The correct answer is C. Modify other clauses and phrases in the sentence

Explanation:

In language, sentences are units that express complete ideas; these are made of clauses and phrases that are smaller units with meaning. Additionally, sentences can contain one clause or multiple ones which makes a sentence more difficult to understand.  This can be explained as each clause or phrase adds meaning to other clauses or phrases and often modifies them. This means every clause or phrase affects the whole meaning of the sentence and thus, sentences with multiple clauses or phrase are difficult is because these modify other clauses and phrases in the sentence.

answer: metaphor: because there is a comparison between the treasures spread on the ground and the evil seed of adam drifting from the shoreline  

explanation: