Answer:
D. has express authority to act as Selma's agent.
Explanation:
According to my research on power of attorney, I can say that based on the information provided within the question Steven now has express authority to act as Selma's agent. This is an authority given by the principal directly to the future agent either written or orally to act on his/her behalf. This is what Selma provided to Steven when she gives him a written power of attorney.
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