Answer:
Correct answer is C: Religious stories are written down in the Vedas.
Step-by-step explanation:
A is not correct as the Gupta Empire is created in 3rd Century AD, while Harappan civilization is one of the oldest civilizations that existed even in the 4th Millennium BC.
B is correct as India and Pakistan are formed in 20th Century.
C is correct as Vedas are the oldest written source that is telling us about earliest periods of this region.
D is also not correct as it also something that happened in the modern period.