Use the Statement Below to Answer the Question(s) That Follow

Use the statement below to answer the question(s) that follow.
Uranium ²³⁸U decays to lead ²⁰⁶Pb with a half life of 4.5 billion years.
-What does the statement mean to a geologist?

A) Half of the ²³⁸U in a mineral will turn into ²⁰⁶Pb in 4.5 billion years.
B) Half of the ²³⁸U in a mineral will turn into ²⁰⁶Pb in 2.25 billion years.
C) All of the ²³⁸U in a mineral will turn into ²⁰⁶Pb in 4.5 billion years.
D) ²⁰⁶Pb will be extinct in 4.5 billion years.
E) ²³⁸U will be extinct in 4.5 billion years.