The correct answer is option 2: 11-4 years.

To understand why this is the correct answer, let`s break down the given information:

1. The average age of the boys in the class is 12 years.

2. The average age of the girls in the class is 11 years.

3. There are 50% more girls than boys in the class.

First, we need to find the ratio of girls to boys. Since there are 50% more girls than boys, we can express this as a ratio of 3:2 (since 3 is 50% more than 2). This means for every 2 boys, there are 3 girls.

Next, let`s calculate the total number of boys and girls in the class. Let`s assume there are 2 boys, as this is the smallest possible number that satisfies the ratio. Using the ratio, we can calculate that there are 3 girls in the class.

Now, let`s calculate the total age of the boys and girls. The total age of the boys is 2 * 12 = 24 years. The total age of the girls is 3 * 11 = 33 years.

To find the average age of the class, we need to divide