Read the sentence below.
"The politician's speech was filled with platitudes about unity and progress, but he offered no concrete plans to achieve either goal."
In the sentence above, what is the most likely meaning of the word "platitudes"?
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A
Detailed and specific policy proposals
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B
Angry and aggressive accusations
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C
Humorous and lighthearted anecdotes
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D
Remarks or statements that are commonplace and unoriginal