Answer: The newspaper industry felt that the radio industry could not be trusted. Before the depression and WWII, the radio industry mainly focused on entertainment. After these events hit, the radio industry became involved in newscasting. The newspaper industry felt uneasy because of the growing audience of the radio industry and the radio industry's habits to advertise also.
The preposition in the sentence is under. A preposition is a word meaning where the noun is in the sentence, the noun is tree, the preposition is under.
