**Core Concept**
The urethrovesical angle, also known as the bladder neck angle, is a critical anatomical parameter in the female urethra. It is defined as the angle formed between the urethra and the bladder neck, and its normal value is essential for maintaining urinary continence.

**Why the Correct Answer is Right**
The normal urethrovesical angle in females is approximately 90 degrees. This angle allows for proper urethral closure during increased abdominal pressure, such as during coughing or sneezing, thereby preventing urinary incontinence. The angle is maintained by the urethral sphincter and the surrounding pelvic floor muscles.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because a urethrovesical angle of 0 degrees would result in a complete lack of urethral closure, leading to urinary incontinence.
**Option B:** This option is incorrect because a urethrovesical angle of 180 degrees would result in a very narrow urethral lumen, potentially leading to obstructive urinary symptoms.
**Option C:** This option is incorrect because a urethrovesical angle of 120 degrees would result in a urethra that is not optimally positioned for urethral closure during increased abdominal pressure.

**Clinical Pearl / High-Yield Fact**
A urethrovesical angle of 90 degrees is essential for maintaining urinary continence in females. Any significant deviation from this angle can lead to urinary incontinence or obstructive urinary symptoms.

**Correct Answer:** C. 90 degrees.