The uterus opens into ……A…… through a narrow …..B…….. The cavity of the …….B……..is called ………..C……..canal which along with ………A…….forms the ……..D……….canal.

Options

A. `{:(A,B,C,D),("Vagina","Cervix","Birth","Cervical"):}`
B. `{:(A,B,C,D),("Vagina","Cervix","Cervical","Birth"):}`
C. `{:(A,B,C,D),("Cervix","Vagina","Birth","Cervical"):}`
D. `{:(A,B,C,D),("Cervix","Vagina","Cervical","Birth"):}`

Answer

To solve the question step by step, we need to fill in the blanks A, B, C, and D based on our understanding of the female reproductive system.

### Step-by-Step Solution:

1. **Identify the structure where the uterus opens:**
- The uterus opens into the **vagina**.
- Therefore, **A = vagina**.

2. **Determine the narrow passage through which the uterus opens:**
- The narrow passage that connects the uterus to the vagina is called the **cervix**.
- Thus, **B = cervix**.

3. **Define the cavity of the cervix:**
- The cavity within the cervix is referred to as the **cervical canal**.
- Hence, **C = cervical**.

4. **Identify the combined structure formed by the cervix and vagina:**
- The cervix and vagina together form what is known as the **birth canal**.
- Therefore, **D = birth**.

### Final Answers:
- A = vagina
- B = cervix
- C = cervical
- D = birth

### Complete Statement:
The uterus opens into **vagina (A)** through a narrow **cervix (B)**. The cavity of the **cervix (B)** is called **cervical (C)** canal which along with **vagina (A)** forms the **birth (D)** canal.