The primary barrier to protect the body against disease is:AHand washingBUnbroken skinCShort fingernailsDProtective gloves

The primary barrier to protect the body against disease is:

A. Hand washing B. Unbroken skin C. Short fingernails D. Protective gloves

Step-by-step analysis:

1. Hand washing: While hand washing is crucial for removing pathogens and preventing the spread of disease, it is not a physical barrier that constantly protects the body.

2. Unbroken skin: The skin acts as a physical barrier that prevents pathogens from entering the body. When the skin is intact and unbroken, it effectively blocks many harmful microorganisms.

3. Short fingernails: Keeping fingernails short can help reduce the accumulation of dirt and pathogens, but it is not a primary barrier against disease.

4. Protective gloves: Wearing protective gloves can prevent direct contact with pathogens, but they are not a constant barrier and are typically used in specific situations.

Based on this analysis, the correct answer is:

B. Unbroken skin