The Desert is the world’s oldest desert and is located along Africa’s southwestern coast.

The Namib Desert.

Explanation: The Namib Desert is thought to be the world's oldest desert and is located in Namibia, specifically along the southwestern coast of Africa,

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.

5.4%

explanation:

the acceptance rate for harvard is 5.4%. this means only 5 percent of people who apply actually get accepted!