Josie listened to a speech on the radio advocating the increased use of automobiles that are not reliant on fossil fuels. One would expect the sleeper effect to be greatest if Josie found out about the background of the speaker the speech and was asked about his views about the issue .

Before; the same day

Explanation:

Josie listened to a speech on the radio advocating the increased use of automobiles that are not reliant on fossil fuels. One would expect the sleeper effect to be greatest if Josie found out about the background of the speaker before the speech and was asked about his views about the issue the same day.

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