There is no odd natural number divisible by 2, so there will be no element in this set, hence it is a null set.
There is only one even prime number which is 2 i.e., there is an element, so it is not a null set.
There is no natural number which is less than 5 and greater than 7 i.e., there is no element, so it is a null set.
Since, parallel lines never intersect each other, so they have no common point i.e., no element, so it is a null set. Hence, option is correct.

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