WebAssign HELP

How do I code the correct answer for the given questions?

Current view of question

Question Code

<br><br>You can use the electronegativity difference between two atoms to predict 
the polarity of the bonds they make. Choose the pair of atoms in each case that 
you predict to make the more polar bond.<br>
<br><font color="#FF0000">Binary choices do not get a mark.</font>
<br><br>
i.<Section><br>
ii.<Section><br>
iii.<Section><br>
iv.<br>

Answer Code

<EQN $MARKOFF = 1;pickone("H-F","H-Cl","H-Br")>
<EQN picksame("H-Cl","H-Br","H-I")><Section>
<EQN $MARKOFF = 1;pickone("N-H","O-H","F-H")>
<EQN picksame("C-H","N-H","O-H")><Section>
<EQN $MARKOFF = 1;pickone("Rb-S","K-S","Na-S")>
<EQN picksame("K-S","Na-S","Li-S")><Section>
<EQN $MARKOFF = 1;pickone("N-O","N-C","C-P")>
<EQN picksame("O-O","N-N","P-P")>

Mode

I have the Mode set to Multi-mode with Multiple-Choice set four times.