Which of the following is a symptom of a right MCA stroke?

In the context of a right middle cerebral artery (MCA) stroke, left body neglect is indeed a prominent symptom. This is due to the fact that the right hemisphere of the brain is responsible for visual attention and spatial awareness for the left side of the body. When a stroke affects the right MCA, it can lead to difficulty in perceiving or responding to stimuli on the left side, resulting in what's known as left unilateral neglect or left hemineglect.

While aphasia typically results from left MCA strokes, as language centers are predominantly located in the left hemisphere for most individuals, visual symptoms can arise from strokes affecting other areas of the brain associated with vision. Similarly, difficulty with bilateral motor functions might be due to more generalized deficits or strokes in other vascular territories, and they are not specifically linked to a right MCA stroke.

Overall, left body neglect directly correlates with the effects of a right MCA stroke, making it the most characteristic symptom among the choices provided.