The correct answer to this question is A, Cat. Answer B, CT, is mainly associated with CT scans or computed tomography scans. Answer C, CA, is primarily related to being an abbreviation for the state of California. The image provided shows a black and white cat, laying down.
This type of question would be found on a spelling test to ensure the student knows how to spell correctly. It could also be found on a related comprehension test, for the student must know how to identify what is in the image. If they didn't comprehend that the picture showed a cat, they more than likely wouldn't know how to spell it correctly.