Answer:
Seas and oceans for B
Mountains for D
Plateau for C
Hills for F
Plains for A
Explanation:
In "b" it says fishing and shipping which would be a major giveaway tht the answer is sea and oceans as fishes live in oceans and ships go on water:)
In "D" it says "natural barriers". Throughout history, mountains have been the #1 natural barrier and protector against enemies.
for C it says scarce rainfalls. Plateaus are desert like and have little to no rainfalls
for A it says fertile soil, good for life. If you ever look at a pic of a plain u would;d see how green and healthy they are. Plains get a lot of rainfall and are amazing for sustaining human and animal life.
"F" was done by using process of elimination :)
HOPE THIS HELPS!