Why were prophets and messengers not sent to India or China, despite their large populations, while they were sent to the Levant, the Arabian Peninsula, Iraq, and Egypt?

Every nation has had a messenger sent to it by Allah to guide and direct it to the truth. Allah Almighty says: (And We have certainly sent into every nation a messenger, [saying], 'Worship Allah and avoid Taghut.') And the fact that the prophets mentioned in the Qur’an and Sunnah are not from specific countries does not negate the sending of messengers from those countries, because Allah did not mention all the messengers in the Qur’an. Allah Almighty says: (And We have certainly sent messengers before you; among them are those We have related [their stories] to you, and among them are those We have not related to you.)