15 month old, cali sucks her thumb when she is scared. according to freud, danielle is most likely in

The correct answer is the oral stage of psychosexual development. 

According to Freud's theory of psychosexual development, the oral stage of development is the first stage of psychosexual development which is seen in infants (0- 12 months of age approximately). During this stage of development, the focus is the mouth, and infants derive pleasure and satisfaction by putting things in their mouth. When Cali is scared, she derives comfort from sucking her thumb.