An online company sold 3,586,598 copies of the book Favorite Pizza Recipes and 2,819,249 copies of the book Easy-to-Learn Guitar Songs.

Round each number to the nearest hundred thousand.

About how many copies of the two books were sold altogether?

A.
5,000,000

B.
6,000,000

C.
6,300,000

D.
6,400,000