Biceps and triceps surround

Options

A. ulna
B. femur
C. radius
D. humerus

Answer

**Step-by-Step Solution:**

1. **Identify the Bones in the Arm:**
- The human arm consists of several bones. The upper arm contains one main bone called the humerus, while the lower arm consists of two bones: the radius and the ulna.

2. **Understand the Location of Biceps and Triceps:**
- The biceps and triceps muscles are located in the upper arm region. The biceps muscle is responsible for flexing the elbow, while the triceps muscle is responsible for extending the elbow.

3. **Determine Which Bone is Surrounded by Biceps and Triceps:**
- Since both the biceps and triceps are located in the upper arm and are attached to the humerus, they surround this bone.

4. **Eliminate Other Options:**
- The radius and ulna are located in the lower arm, and the femur is the thigh bone. Therefore, these bones cannot be surrounded by the biceps and triceps.

5. **Conclusion:**
- The biceps and triceps surround the humerus bone in the upper arm.

**Final Answer:**
The biceps and triceps surround the humerus.

---