On separating the odd and even series, we observe the following pattern: ODD SERIES: $3, 7, 13, 21, 31, 43$ EVEN SERIES: $2, 4, 10, 18, 28, 40$

The odd series increases by $4, 6, 8, 10, 12$. The even series should start from $0$ and increase by $4, 6, 8, 10, 12$.

Therefore, the first term in the even series should be replaced by $0$, making option A correct.