The correct option is A 1
Natural numbers are set of numbers which do not include fractions, decimals and they start from 1 and continue infinitely in the positive direction, i.e., 1, 2, 3, 4, 5....
Whole numbers are also set of numbers which do not include fractions and decimals, but they start from 0 and continue infinitely in the positive direction, i.e., 0, 1, 2, 3, 4, 5....
In the given options, it can be seen that only 1 is a number, which is both a natural number and a whole number.