I beg someone to answer ive posted this 3 times and im still not sure how to do it Which of the following is the best estimate for the number of seconds which have elapsed since the start of the year 2000?

(note: date was June 2001)

A) 3 X 10⁴
B) 3 x 10⁵
C) 3 x 10⁶
D) 3 X 10⁷
E) 3 X 10⁸

(with working out please)