Where (what memory location) is the data read from for the following code:
org $3000
ldaa #$c2

ORG $3000 tell us that we want to load the program from the address $3000.

LDAA #$C2 tell us to load the value contained in the address present in the register C2 into the accumulator.

Explanation:

ORG instruction in  microprocessor does not have a fixed address. It tell us where to begin the execution of the program by loading into a starting address space. It does not uses fixed addressing

LDAA instruction uses indirect addressing by placing the value from the address present in the register. Here  the address is contained in register C2.