To answer this question, we need to consider the percentage of lightning strikes that actually strike the ground.
Option A) 75 - This option is incorrect because it suggests that 75 out of 100 occurrences of lightning strike the ground, which is not supported by the given information.
Option B) 50 - This option is incorrect because it suggests that 50 out of 100 occurrences of lightning strike the ground, which is not supported by the given information.
Option C) 25 - This option is correct because it suggests that 25 out of 100 occurrences of lightning strike the ground. Since the question does not provide specific data on the percentage of ground strikes, we can assume that 25% is a reasonable estimate.
Option D) 5 - This option is incorrect because it suggests that only 5 out of 100 occurrences of lightning strike the ground, which is not supported by the given information.
The correct answer is C) 25. This option is correct because it provides a reasonable estimate that a quarter of the lightning occurrences strike the ground.