Answer:
A. They reflect the light of the sun.
Explanation:
Both the coma and tail are illuminated by the Sun and may become visible when a comet passes through the inner Solar System, the dust reflects sunlight directly while the gases glow from ionisation.
You can see comets with your unaided eyes, but it will become truly spectacular through binoculars and telescopes. What you should expect to see is a small, bright, fuzzy spot, possibly with an orange or green hue. Binoculars will reveal the comet's faint tail extending generally upwards, away from the sun.
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