Which of these is a primary sexual characteristic in human males?

Options

A. Development of facial hair
B. Presence of a penis
C. Development of mammary glands
D. Broadening of shoulders

Answer

To determine which of the options is a primary sexual characteristic in human males, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Primary Sexual Characteristics**:
- Primary sexual characteristics are those that are present from birth and are directly involved in reproduction. They include the external and internal genitalia.

2. **Identify the Options**:
- The options provided are:
a) Development of facial hair
b) Presence of penis
c) Development of mammary glands
d) Broadening of shoulders

3. **Analyze Each Option**:
- **Option a: Development of facial hair**: This is a secondary sexual characteristic that develops during puberty, not present at birth.
- **Option b: Presence of penis**: This is a primary sexual characteristic, as it is present from birth and is part of the male reproductive system.
- **Option c: Development of mammary glands**: Mammary glands are typically associated with females and are also a secondary sexual characteristic that develops during puberty.
- **Option d: Broadening of shoulders**: This is another secondary sexual characteristic that occurs during puberty and is not present at birth.

4. **Conclusion**:
- After analyzing the options, the only one that qualifies as a primary sexual characteristic in human males is **Option b: Presence of penis**.

### Final Answer:
The primary sexual characteristic in human males is the **Presence of penis**.

---