easy · GMAT Verbal

Which new fact most strengthens the conclusion?

1. Purchases had already been rising at the same rate before live chat and continued along that trend afterward.
2. Very few of the people measured actually used the change.
3. A separate change occurred at the same time and could explain the result.
4. Visitors who used live chat purchased at a higher rate than similar visitors who did not.
5. The organization expected the result to improve before collecting any data.

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