Why do structures like the Eiffel tower have a tapering tip but a broad base?

As the effel tower being roughly perpendicular to the earth's surface,exerts an enormous perpendicular force (or pressure) on ground.For that reason when the base of eiffel tower is made broad,this enormous pressure gets spreads throughout a huge area and acts on a larger area

and hence it avoids the sinking of the tower.

a.) is the correct answer.

explanation:

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas