1. By definition, an expression in scientific notation has the following form:
Where a is a number greater or equal to 1 and less than 10.
2. Therefore, as you can see, the expression given in the options shown in the problem above that has the form , where 2 is a number greater or equal to 1 and less than 10.
3. Then, the answer is the option b.
Its b m888888888888888888
hope that helps
So, having this in mind, the correct answer has to be B. 2 x 10-5, because 2 is the only number between 1 and 10 here.