Final answer:
According to identity theory, other creatures can have the same type of mental states as humans, even if they are not physically similar.
Step-by-step explanation:
According to identity theory, mental states are brain states. This means that as long as other creatures have similar brain states to humans, they can have the same type of mental states as humans.
For example, if we define mental states as experiences of pain, then other creatures that have brain states associated with pain, even if they are not physically similar to humans, can experience pain as well.
Therefore, the answer is a) Yes, other creatures can have the same type of mental states as humans even if they are not relevantly similar to us physically as long as their brain states are similar.