Answer: Option (c) is the correct option.
Step-by-step explanation:
Nylon is a synthetic polymer that is, it is a man-made polymer. It has a more compact structure and high melting point.
Nylon is a soft polymer and it is able to resist sunlight.
Though ignition of nylon is slower but once a nylon fabric or nylon catches fire then it can stick to the human skin.
Hence, we can conclude that the most dangerous source to be around Franklin's shirt is fire.