Step 1:
Historical and cultural information can indeed be derived from Vedic and Puranic literature.
Thus, Assertion (A) is correct.
Step 2:
Not every Puranic statement is treated as historically or literally authentic.
Hence, Reason (R) is incorrect.
Step 3:
Purāņas contain mythology, philosophy, genealogy, and symbolic narratives.
Step 4:
Therefore:
\[
\boxed{\text{A is correct but (R) is not correct}}
\]
Hence, the correct answer is:
\[
\boxed{\text{(3)}}
\]