Technically, the only way to correctly answer this question is to read the document itself but the answers pretty simple to answer without it too.
The Nile was the holy grail for the people of ancient Egypt. After all, it provided water to drink, and also water for agriculture. It also provided the Egyptians with many fertile lands that were great for farming. Because of this, they prayed to their gods all the time so that the Nile wouldn't dry out.
The correct answer to this open question is the following.
This is the way we experience these Greek contributions today
Drama/Theater: Greek authors were fantastic writers who wrote classic plays of different genres. For instance, in Athens, the most important city-state of ancient Greece, they built the Theatron, were artists performed these plays in the first form of theaters, as we know them today.
History: Ancient Greece is an obligated reference in human history for the importance of its culture, civilization, literature, and pantheon of gods that influenced other civilizations such as the Romans. His political history is so influential into a modern-day form of governments, like the one in the United States, in that the Athenians were the first to develop the concept of Democracy, and the right of men to elect their rulers.
Trial by Jury: the Board of Archons were the ones who imparted justice in ancient Greece. It was formed by nine members who listened to the complaints of the Greek people. This concept influenced the Romans and modern-day justice systems such as the one in the United States.
Both a and c are correct, however I think that A would be the most correct answer in this case.
Buddha said that people should live morally, compassionately, and peacefully. He also advised his followers to abide by the Eightfold Path (Right View, Right Resolve, Right Speech, Right Conduct, Right Livelihood, Right Effort, Right Mindfulness, Right Concentration). Hope this helps.