answer number 3 plz (i give brainliest)

Answer:
Pretty sure it's B.)
Step-by-step explanation:
I wrote 6 x 10^5 in standard form (6 x 100000 = 600000).
Divided the product by 15 (600000 divided by 15 = 40000).
The only choice that matches is /B/ (4 x 10^4 ---> 4 x 10000 = 40000).