World War 2 occurred in the late 40's, so this is most likely why there is a dip in that age group.
Basically add up all the sides... And that's the perimeter don't forget to add your units
A succession of ocean waves set in motion by a submarine earthquake (also known as underwater earthquake) is called a tsunami. This happens when tectonic plates move, converge, or subduct. Submarine earthquakes are common in Asia where there’s a submarine earthquake zone called Pacific Ring of Fire.
Answer:
c is correct. mark brainliest please???!!!!
Explanation: