An Australian importer wishes to exchange $A for Japanese yen to pay for goods. How many $A are needed to pay for a bill of $500,000$ yen if $$1$A $=70$ yen?

A: $$350,000$

B: $$3,500,000$

C: $$71,428\mathrm{.}57$

D: $$7,142\mathrm{.}86$