0
1
3
4
Answer is Right!
Answer is Wrong!
The answer is $\boxed{3}$.
The missing number is the sum of the first two numbers in the sequence, minus the third number. In this case, the first two numbers are $1$ and $2$, and the third number is $4$. Therefore, the missing number is $1 + 2 – 4 = 3$.
Option A, $0$, is incorrect because it is not the sum of the first two numbers in the sequence.
Option B, $1$, is incorrect because it is the first number in the sequence, not the missing number.
Option C, $3$, is the correct answer because it is the sum of the first two numbers in the sequence, minus the third number.
Option D, $4$, is incorrect because it is the third number in the sequence, not the missing number.