U-235,the Isotope of Uranium Commonly Utilized in Nuclear Power Plants,is

Multiple Choice

U-235,the isotope of uranium commonly utilized in nuclear power plants,is ____________.

A) the most common of the naturally occurring isotopes of that element
B) heavier than the other well-known isotope of uranium
C) rare even in uranium oxide deposits,and thus usable reactor fuel must be enriched with respect to this isotope