Discussion
Whose observation-argument pair was most flawed?
Answer: A
The most flawed pair is Ron's.
Tungsten is used for bulb filaments because it has a very high melting point (about 3,400°C) and a high resistivity. A filament is meant to turn electric energy into heat until it glows; a low-resistance wire that 'limits the loss of electric energy into heat' would not light up at all. So Ron's argument contradicts the very job a filament does.
The other three are sound. Light travels far faster than sound, so the flash is seen before the thunder is heard (Harry). Sea water is denser than river water, so the same ship displaces less volume and floats higher (Hermoine). A fuse wire has a low melting point and melts when the current is too large, breaking the circuit (Dobby).
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