Tim remembers the exact moment he heard about the 2012 mass shooting at sandy hook elementary school in newtown, connecticut. tim has a(n) memory for this event.

The answer is flashbulb memory. This kind of memory is a thorough and intense memory that is put away on one circumstance and recollected for a lifetime. Typically, such memories are accompanying with significant historical or true to life events like in this question which is the mass shooting.

the rebels’ chances of victory at lexington & concord were fairly slim, given the fact that most of them very untrained and they were up against the world's greatest military force.  

where are the choices