Answer:
B
Explanation:
The scientific notation is symbol or the shorten way to rewrite the number that is too small or too large to write the full number. The scientific notation of a number has the form as the formula below:
c x 10^n
Based on this formula, it can be seen that answer C and D are not the correct answer.
Furthermore, in this formula, c can be any number ranging from 1 to 10 but not including 10 and n has to be an integer number.
So that in answer A, c = 56 > 10 is inappropriate.
In answer B, 1< c = 5.6 < 10 and n = 6
=> B is the correct answer