Anita is an author who submits short poems to magazines.She never knows for sure which poems will be selected for publication, but the more poems she submits, the more likely she is to have a poem accepted.Based on what is known about schedules of reinforcement, you should conclude that Anita's submission of poems is being reinforced based on a:

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With a variable-ratio schedule, reinforcement is provided after a variable number of responses. In this case, Anita's submission of poems is reinforced when one of her poems is selected for publication. She does not know how many submissions will be required before a poem is accepted, but the more poems she submits, the more likely she is to have a poem accepted. This is similar to a variable-ratio schedule, in which reinforcement is provided after a variable number of responses or actions. This type of reinforcement schedule tends to be highly resistant to extinction, meaning that it is unlikely that Anita will stop submitting poems, even if her poems are not accepted for publication every time.

Anita Is an Author Who Submits Short Poems to Magazines