[单选题]
An average human has a heart raz( pc2yw9;58ej, xi gextzq9 wte of 70 beats per minute. If someonetm d1f(:nxk onuq:ty.j sgz)(: (-d1w /sjvqe's heart beats at that average: djzqstqdjfmx1ys:( (w e/)nt 1o:u( .k -gvn rate over a 70-yr lifetime, how many times would it beat?
A. $7 \times 10^5$
B. $2 \times 10^{6}$
C. $2 \times 10^{7}$
D. $3 \times 10^{9}$
