Step 1:
Puranas are ancient Hindu texts containing mythology, cosmology, and legends.
Step 2:
The major Puranas are called Mahapuranas.
Step 3:
Traditionally, Hindu literature recognizes:
\[
18 \text{ Mahapuranas}
\]
Step 4:
Thus, the correct answer is:
\[
\boxed{\text{(4) 18}}
\]