Rifles aren't the problem, though they are an easy thing to blame. More people are killed with hammers each year than with rifles per FBI statistics. So-called gun violence and violence overall have roughly halved since the 1990s - the trend is downward, despite gun sales reaching all time records year after year since around 2011.
Schools are also safer than ever, despite the media contagion surrounding shootings. Your children are more likely to be killed by lightning than be shot at school. So stop letting the media fool you into paranoia about a perceived risk that is far out of proportion to reality.
Keep in mind the deadliest school massacre happened back in 1927 using primitive explosives... it would be relatively trivial to use this, or other equally deadly means to cause death and mayhem if that is the objective. The truck attacks in Nice being a rather gruesome example. It is extremely difficult to defend against lone wolf attackers.
BTW, the poll uses a leading question and trap answer choices. It's pretty clear what the OP's viewpoint is from how the poll is written.