Step 1:
Rgveda mentions many divine powers representing natural and cosmic forces.
Step 2:
The principal Vedic deities are traditionally grouped into:
\[
33 \text{ Devatās}
\]
Step 3:
These include Vasus, Rudras, Adityas, Indra, and Prajapati.
Step 4:
Hence, the correct option is:
\[
\boxed{\text{(1) 33}}
\]