Answer:
The option "D" is correct.
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Explanation:
First of all we have to find the volume of each skittle
--> For that we would divide the
volume of the first box by the number of skittles in it

Similarly you can also find it from the second box on dividing it's volume (= 108) by the number of skittles in it (i.e. 258) which would also give the same answer (on rounding off).
NOW to find the number of skittles in the third box just find its volume and then divide it by the volume of each skittle

Because of rounding-off we get an approximate answer which is close to the real answer but not 100%
the correct value, however in case of MCQs it clearly shows us the correct option --> that is 762 in this case.
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