Hello!
First, let's remember just one thing about scientific notation:
• The numbers in scientific notation can be written in the interval from 1 to 9.999...
[tex]1\le x<10[/tex]
Knowing it, let's answer your question.
We have the number 96,989,200. Notice that as it must be bigger than 1 and smaller than 10, we have to change the dot, look at the image:
Notice that as the dot was dislocated 7 units to left, so we can rewrite this number as:
[tex]9.69892\cdot10^7[/tex]
Right answer: B.
