A defendant is liable for negligence when the defendant breaches the duty that the defendant owes to the plaintiff. A defendant breaches such a duty by failing to exercise reasonable care in fulfilling the duty. Unlike the question of whether a duty exists, the issue of whether a defendant breached a duty of care is decided by a jury as a question of fact. Thus, in the example above, a jury would decide whether the defendant exercised reasonable care in handling the bags of grain near the child.