If the Half-Life of a Material Is 45 Years, How $1 / 2$

Multiple Choice

If the half-life of a material is 45 years, how much of it will be left after 100 years?

A) Iess than $1 / 2$ but more than $1 / 4$
B) more than $1 / 4$ but less than $1 / 2$
C) Iess than $1 / 4$ but more than $1 / 8$
D) Iess than $1 / 8$
E) more than $1 / 2$