Which of the following molecules is non-polar in nature?

Given below are two statements:
Statement-$I$: Since fluorine is more electronegative than nitrogen,the net dipole moment of $NF_3$ is greater than $NH_3$.
Statement-$II$: In $NH_3$,the orbital dipole due to lone pair and the dipole moment of $N-H$ bonds are in opposite direction,but in $NF_3$ the orbital dipole due to lone pair and dipole moments of $N-F$ bonds are in same direction.
In the light of the above statements,choose the most appropriate from the options given below.

Which of the following molecules has a net dipole moment of zero?

Which molecule is polar?

Identify the correct statements from the following. $(1)$ The dipole moment of $CO_2$ and $BF_3$ is zero. $(2)$ The dipole moment of $NF_3$ is higher than the dipole moment of $NH_3$. $(3)$ The dipole moment of $HI$ is lower than the dipole moment of $HCl$.

The correct order of dipole moment for the following molecules is: