[单选题]
An average human has a heart rate of 70ff 4(d9n ladf- beats per minute. If someonemzjzq t.a7p 1.'s heart beats at that average rate over a 70-yr lifetime, how many t.az j7mtqp1 .zimes would it beat?
A. $7 \times 10^5$
B. $2 \times 10^{6}$
C. $2 \times 10^{7}$
D. $3 \times 10^{9}$
