Assuming the diodes to be ideal in the figure, for the output to be clipped, the input voltage $v_i$ must be outside the range
1. $-1$ $V$ to $-2$ $V$
2. $-2$ $V$ to $-4$ $V$
3. $+1$ $V$ to $-2$ $V$
4. $+2$ $V$ to $-4$ $V$