The world's longest river, the Nile, flows through the continent of Africa. It is approximately 6,650 kilometers (4,130 miles) long and is a significant geographical feature in northeastern Africa. Therefore, the correct answer is (B) Africa.

Jean-Jacques Rousseau, an Enlightenment philosopher, political theorist, and writer, had a profound influence on the intellectual climate leading up to the French Revolution. His ideas, particularly those expressed in works like "The Social Contract" and "Emile," emphasized the concepts of popular sovereignty, equality, and the general will. Rousseau's emphasis on individual rights, democratic principles, and the idea that government should be based on the will of the people contributed to the ideological foundation that inspired the leaders and thinkers of the French Revolution in the late 18th century.

Rajendra I, the son of Raja Raja Chola I, is credited with capturing the whole of Sri Lanka and making it a part of the Chola Empire. He undertook successful military campaigns, extending Chola influence beyond the Indian subcontinent.