Explanation:

- The Convention on the Elimination of all forms of Discrimination Against Women (CEDAW) is a significant international treaty aimed at promoting women's rights and achieving gender equality.

- It was adopted by the United Nations General Assembly as a way to address and combat discrimination against women globally.

- Option 1, 1981: This is the year CEDAW entered into force, not when it was adopted.

- Option 2, 1975: This year marks the International Women's Year and the first World Conference on Women, not CEDAW's adoption.

- Option 3, 1979: This is the correct year when CEDAW was adopted by the United Nations General Assembly.

- Option 4, 1983: This year does not have any direct connection with CEDAW's adoption.