I am pretty sure it is A or C.
The Sahara, the largest hot desert in the world, covers 3.3 million square miles and is located in the northern part of Africa. The Kalahari Desert, located in southern Africa, covers 362,500 square miles. The Namib Desert, the world's oldest desert, is found in the southwestern portion of the continent and covers 100,000 square miles.
<h3><u>President in role of Head of the State:</u></h3>
The president of America, practices both as the state's head and also as the chief executive. He is the head of the country with certain powers in his hands which he can exercise when needed. The president performs many ceremonial roles, and represents the nations in many forms, as the state's head.
And, working as the chief executive, the president helps in directing activities to the thousands of employees of the branch who can carry our lawful activities. In previous era's, the head of the state was known as the king or the queen, who took care of their nation with utmost care, keeping their citizens above all.
Answer:
Due to lack of skillfull manpower
Due to lack of education
Corruption
Brain drain
people are being selfish so, they just think about themselves but not for nation.