Choose the correct preposition to complete the investigative journalist's report.

The shocking study claiming that chocolate cake is a superfood was conducted entirely _____ the auspices of the International Bakery Association.

The correct answer is under.

The standard idiomatic phrase is "under the auspices of," which means with the help, support, or protection of a particular organization or person. Even though the study was conducted by the association, the specific noun "auspices" strictly pairs with the preposition "under."