Explanation:

All the names given in the question are of animals and while arranginh them in a meaningful and logical order we have to arrange the animals in ascending order according to their shapes and sizes.

Fly is the smallest amongst all the given animals 

then Rat comes on the second number 

then comes the Monkey

Then the Lion and finally Elephant as it is the largest animal of all the given options.

hence, 43152 is the correct option.