Child protection social worker Sarah Waverly conducts a series of workshops for school social workers about the implications of the new child welfare legislation. In this activity, she is assuming the role.

Trainer.

Explanation:

A trainer is someone who instructs others about something.

In the given case, Sarah Waverly is playing the role of a trainer. She is instructing the school social workers about the new child welfare legislation by conducting a series of workshops.

The role of a trainer is that he/she instructs other people and help them to develop the skill of efficiency.

So, the correct answer is a trainer.

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