Answer:
Suddenly, the thunder clapped and the lightening struck.
<span> are a base 10 system, but they're not a </span>place-value<span> system. Until the Indo-Arabic system became the standard written way to denote numbers, most of the </span>numeral<span> systems of the world were some sort of base 10 system, but not a</span>place-value<span> system.</span>
They are all correct but A. Explains it the best
