Final answer:
The quote that best supports the answer to Part A in "The Masque of the Red Death" is 'The Red Death is among us, and no one is safe.'
Step-by-step explanation:
The quote that best supports the answer to Part A in "The Masque of the Red Death" is 'The Red Death is among us, and no one is safe.' This quote shows that the Red Death, which represents a deadly disease, is present and poses a threat to everyone. It reinforces the idea that no one can escape or be safe from this disease.