Developed nations find it difficult to get aid to the people of the sahel because
a. there is constant political unrest
b. countries cannot pay for the aid
c. all but one of the countries is landlocked
d. mountain ranges are rugged barriers

The best answer to the question stated above is letter C. all but one of the countries is landlocked.

Developed nations find it difficult to get aid to the people of the Sahel because all but one of the countries is landlocked.
THE SAHEL TODAY:
>>More developed nations have difficulty giving aid to the Sahel because the region is landlocked, or cut off from the sea.
>>When a drought hits the region, desertification increases and people flee to the cities, turning them into huge refugee camps.

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].