The meaning of the word "surrogate" as it is used in chapter 1 is:
B. A person deputizing for another in a specific role or office
A surrogate can be described as something that takes the place of another. Often, people tend to use surrogates during childbirth or for official purposes.
In the sentence from chapter 1 above, we can see that the usage of the word suggests that a person is serving as a deputy for another. This is some form of replacement. So, option B is right.
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