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Based on "Wendy appears in every photograph that Selma appears in," what can be deduced?

  1. S implies W

  2. W implies S

  3. If S then W but not vice versa

  4. Both appear in every photo of the other

The correct answer is: S implies W

In logic terms, if Wendy appears in every photograph that Selma appears in, it implies that Selma's appearance is a necessary condition for Wendy's appearance. This relationship can be represented as "S implies W." Therefore, the correct answer is A. Option B is incorrect because the statement tells us that Wendy appears when Selma does, not the other way around. Option C is incorrect as it implies a one-way relationship, which is not indicated in the original statement. Option D is incorrect since the statement only states Wendy appears in every photo Selma appears in, not necessarily that they both appear in every photo of each other.