Which of the following best describes the physical state of a person with low blood sugar?

In the case of a person with low blood sugar, often referred to as hypoglycemia, the physical state you would most commonly observe includes characteristics such as paleness and clamminess of the skin. When blood sugar levels are low, the body experiences a release of adrenaline, which can lead to symptoms like sweating and a pale appearance due to constriction of peripheral blood vessels. This response is part of the body's fight-or-flight mechanism, creating a clammy feeling due to moisture on the skin as a result of sweating.

While the other choices describe various states that might be associated with other conditions, such as dehydration or fever, they do not accurately reflect the typical presentation of hypoglycemia. Therefore, the description of "pale and clammy" provides the most accurate representation of a physical state seen in someone experiencing low blood sugar.