On Average,if You Examine 1 Million Human Cells Looking at a Single

On average,if you examine 1 million human cells looking at a single gene,you'll find one cell with a mutation in that gene.If you were looking at a gene that could lead to cancer when mutated,how many mutated copies of that gene would you find in a person? (Assume a person contains 100 trillion [100,000,000,000,000] cells.)

A) 100,000,000
B) 1,000
C) 1,000,000
D) 10,000,000,000
E) 100