Micha Offers to Pay an Investor of a Lump Sum

Micha offers to pay an investor of a lump sum in her business today $1000 in one year's time,$2000 in two years' time,$3000 in three years' time and $4000 in 4 years' time.If the interest rate is 8%,what is the minimum value of the lump sum she must ask of an investor if the net present value (NPV) is to be equal to zero?

A) $6,660.02
B) $6,836.34
C) $7,962.22
D) $8,468.56
E) $7,350.30