How Does Enriched Uranium Differ from Naturally Occurring Uranium

Multiple Choice

How does enriched uranium differ from naturally occurring uranium?

A) Naturally occurring uranium is mostly ²³⁸U,while enriched uranium is mostly ²³⁵U.
B) Naturally occurring uranium contains 1% ²³⁸U,while enriched uranium contains 3- 5% ²³⁸U.
C) Naturally occurring uranium contains 1% ²³⁵U,while enriched uranium contains 3- 5% ²³⁵U.
D) Naturally occurring uranium is mostly ²³⁵U,while enriched uranium is mostly ²³⁸U.