For this problem is it implicit interest rate? im sure of the answer but i don't understand how to get it. can you break it down for me?

Q14. Problem Type: implicit interest rate. t You are 45 years old and expect to retire at age 65, i.e., in 20 years. If you wish your investment portfolio, which will earn a 10% 'return, compounded quarterly, to be worth $500,000 on the day you retire, how much must you deposit today? Cm=4 PV=? A. $ 17,075.34 B. $ 69,352.28 C. $ 74,321.81 D. $186,215.31 E. $341.506.73