Step-by-step explanation
Step 1: We look at the whole number. One way to determine the greatest number is to compare their whole numbers. If one number has a larger whole number than the others, it is the greatest number. Similarly, if one number has a smaller whole number than the others, it is the least number.
In this case, we have:

Step 2: We compare the decimal places.
We can see that the middle numbers has a 2 in the tens, and the other has a 7. 7 is greater than 2, so 78.5318 is greater than 29.0552.
Similarly, we can see that the lower numbers have a 0 in the ones, and the other has a 7. 7 is greater than 0, so 7.1 is greater than 0.4197.
Thus, the correct ordering of the numbers from greatest to least is:

Answer
B. M, P, N, O, L