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"Sarah appeared serene as she bowed in front of the massive crowd, however, her hands betrayed her with their almost invisible-but constant--shaking."

Identify the context clue and its function in the sentence above.

A) The work invisible signals that Sarah was serene.
B) The word however signals that
Sarah is actually nervous.
C) The word constant signals that Sarah is actually serene.
D) The word almost signals that what is being said about Sarah is false.