The fleet improvements that they made were <span>Ticonderoga-class cruisers and Los Angeles-class submarine
</span> Ticonderoga-class cruisers is a guided missile cruiser that has increased capability with aegis combat system and Los Angeles-class submarine is a type of attack submarine that is powered by nuclear.
The only option that is not generally a reason why historians study societal change would be "<span>d. to estimate how long it would take to build a road system," since this requires a separate type of research. </span>
The answer is c. That’s the only one that’s correct the rest is incorrect
Points.........................................