c is first in the sequence: c is the only phrase that can begin the sentence. It starts telling us something about yesterday.c is followed by a: a directly adds to c. It says that yesterday the subject bought.a is followed by b: b tells us what the subject bought. It says that the subject bought a camera.b is followed by d: d tells us why the subject bought a camera. It says that the subject bought a camera to photograph the parade.Finally, the correct sentence is 'Yesterday I bought a camera at the store to photograph the parade'.Thus, the correct sequence is c a b d. Hence, A is the correct option.