Final answer:
A common sign of low blood sugar in a person with diabetes is shakiness. It is caused by adrenaline released when blood sugar levels drop too low, which requires prompt management.
Step-by-step explanation:
A common sign of a low blood sugar, also known as hypoglycemia, in a person with diabetes is B) Shakiness. When blood sugar levels drop too low, the body reacts by releasing adrenaline, causing symptoms like shakiness, dizziness, sweating, hunger, irritability, and palpitations.
Other signs of low blood sugar can include confusion, blurred vision, and in severe cases, loss of consciousness. It is important for a diabetic to recognize these symptoms early to manage their blood sugar levels promptly.