Need help with this question, here can we take D as a fraction, say 2/3. If yes why? isn’t D have to be even? Confused with B vs D as an ans

Not necessarily. Suppose p = 9 and q = \frac{4}{9}. Then p is odd but pq is even.

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abcd is even & abc is odd. In that case, D has to be even. so can we take D as a fraction? I am super confused about this.

Have you seen my above example?

Odd and Even only applies to an Integer. So D must be even integer.

Also abcd is even positive, that mean none of either a,b,c,d is zero.

Hence, D is positive even integer.

Minimum value for D could be 2.