The International Human Rights Convention that the United Nations brought into force around 1990 primarily relates to the rights of which group of people?

Introduction / Context:
This question deals with a landmark human rights treaty associated with the early 1990s. Around this time, the world community focused strongly on protecting vulnerable groups and codifying their rights through binding conventions. One of the most important of these instruments is the Convention on the Rights of the Child, which is frequently associated in exam literature with the year 1990, when it entered into force and began to shape national laws and policies across the globe.

Given Data / Assumptions:
• The question mentions an International Human Rights Convention linked to the United Nations and the year 1990.
• The options list four vulnerable groups: children, persons with disabilities, stateless persons and migrant workers.
• It is assumed that you are aware that the Convention on the Rights of the Child is one of the most widely ratified human rights treaties and is often associated with 1989 to 1990 in standard GK references.

Concept / Approach:
The central idea is to connect the year around 1990 with the major UN human rights convention that became effective at that time. The Convention on the Rights of the Child was adopted by the UN General Assembly in 1989 and entered into force in 1990. Exams often simplify this timeline and simply state that the convention was adopted in 1990. Other conventions related to persons with disabilities, stateless persons and migrant workers were adopted in different years, not specifically tied to 1990 in most general knowledge questions.

Step-by-Step Solution:
Step 1: Recall that the Convention on the Rights of the Child is the key global treaty defining children's civil, political, economic, social and cultural rights.Step 2: Note that this convention was adopted in late 1989 and entered into legal force in 1990, which is why exam questions often link it to 1990.Step 3: Compare this with the Convention on the Rights of Persons with Disabilities, which was adopted much later, in the 2000s.Step 4: The conventions on stateless persons and migrant workers date from earlier and later periods and are not specifically tied to the 1990 milestone in the same way.Step 5: Therefore, the International Human Rights Convention associated with 1990 in common exam practice is the one that protects children.

Verification / Alternative Check:
You can verify this by recalling that the 1990s were declared the World Summit for Children era and many national campaigns for child immunization, education and protection were launched in connection with the new convention. Study materials on human rights almost always mention that the children's rights convention became a global standard around 1990, which matches this question directly.

Why Other Options Are Wrong:
• Persons with disabilities: The main UN convention on disability rights was adopted years later and is not the treaty generally linked with the year 1990.
• Stateless persons: There are separate conventions relating to stateless persons, but they come from an earlier period and are not highlighted as a 1990 milestone.
• Migrant workers: The convention on migrant workers is important, but it is not the one commonly associated with 1990 in basic GK questions.

Common Pitfalls:
A common error is to overthink the date and worry about the difference between the adoption year and the year the convention entered into force. Exam questions sometimes simplify these details. Another pitfall is to confuse various vulnerable-group conventions because their names sound similar. To avoid this, remember that around 1990, children came to the forefront of the global human rights agenda, making the children's rights convention the most relevant here.

Final Answer:
The International Human Rights Convention associated with the year 1990 primarily relates to the rights of children.