When there is a lightning strike, we hear thunder because:

a. The end of the lightning strike hits the ground at very high speed.

b. The air is heated up to a very high temperature and expands violently.

c. The hailstones and raindrops falling out of the cumulonimbus are hitting the ground at very high speed.

d. The cloud explodes as positive and negative charges neutralize each other.

e. The lightning strike hits the sound barrier and produces a sonic boom.

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