This graph shows the number of shipwrecks in the mediterranean sea from 150 bc to ad 350. which conclusion can be drawn from the data ?
a) after 50 bc, people developed better navigation and ship building methods to protect their ships
b) the region witnessed the dark ages, so there was no information about shipwrecks after 200 bc
c) more shipwrecks occured after 200 bc due to frequent wars in the region
d) people stopped using the mediterranean sea for trade after ad 50, which reduced the number of ship wrecks
e) the data does not show any definite trend in shipwrecks in the mediterranean from ad 50 ad to ad 350