The common geographic factor for Egypt and the fertile crescent were the big rivers, they made big alluvial deposits on their shores each year and allowed the people to have sufficient amount of food production. That opened the gates for civilizations to flourish in this places.
Based on my research, the best answer to your question should be option D. Greenhouse gases warm up the planet, and also makes human life better. Without the, the world would most likely be cold.
From the findings of the global Christianity reports the Christianity is found in 200 countries with about 2.18 billion Christians and began in the 7th century in china but did not start unit till the 16 Th century, with an increased significant restriction on the activities during the religious reform of the 1970s. And the practice of the religion continues to be strictly controlled by the govt authorities.
