The correct order is:
3. A system of social classes based on birth evolved;
1. Castes are rigid and inflexible; people are born into a caste and cannot leave it;
4. Castes are a prominent part of people's lives, but people may have been able to move around;
2. Discrimination based on caste is determined to be illegal;
The caste system is a system with very long history, and it has been part of the Indian culture for centuries. At the begging, when it was implemented into the society, the caste system was very rigid and strict, and people were destined from birth to a certain social status for the rest of their lives. This lasted for a very long period of time. In the past century, the caste system started to be a bit more flexible, so certain individuals that showed greater qualities were able to progress into the caste system. And recently, the caste system, and discrimination based on it, have been made illegal in the country, so officially it has come to an end.
India was referred to as the jewel in the imperial crown
Although characteristics varied slightly with each small settlement, the primary characteristics that spread through them all was hard work, and a fear of God.
The answer could vary between Mars and Neptune. The tilt of Jupiter is a mere 3 degrees as opposed to Earth tilt of 23.5 degrees. The tilt of Uranus is a whopping 98 degrees, which makes its seasons very erratic and violent. The tilt of Mars and Neptune are 25 and 28.32 degrees, respectively, so Mars would probably be the best answer.