An investor has purchased 10,000 shares of a mutual fund for a total investment of $860,000. The investor has also received $20,000 in dividends and reinvested these funds back into the fund. What's the investor's total cost basis for the mutual fund shares?
A) $860,000
B) It depends on the market price when the investor ultimately redeems the shares.
C) $20,000
D) $880,000