Step 1:
The phrase “Vedānām Samavedo'smi” means:
\[
\text{Among the Vedas, I am Samaveda}
\]
Step 2:
This statement occurs in Bhagavad Gītā.
Step 3:
The statement is spoken by Lord Krishna while describing his divine manifestations.
Step 4:
Thus, the correct option is:
\[
\boxed{\text{(2) by Śrikrşņa in Gītā}}
\]