Consider this risk register for cycling to university. Which risk has the greatest severity?

$\backslash$table$[[,,$Prob,Imp$],[1,$It rains and you have to sit in wet clothes all morning,,$],[2,$You hit a pothole in the road, buckle the front wheel and fall off,,$],[3,$You cycle over some glass and get a puncture,,$],[4,$Your bike is stolen from Campus,,$]]$