Look at the frame from Iqbal.

Iqbal thinks constantly about how hard his life is, but he can't think of a way to be free. All the boys in the factory are debt slaves. None of them have a peshgi, which is what the debt is called, less than when they started to work for Ghullah. After five years in the carpet factory it would become even worse for Iqbal.

Which excerpt from the prologue of Free the Children reflects what is happening in this frame?

With the help of a human-rights organization, Iqbal was able to escape and go to school. Iqbal completed two grade levels that first year.
In exchange, Iqbal, said to be only four years old at the time, was forced to join several other child weavers squatting before looms in the owner's factory.
The man had not only the right to Iqbal's labour, but also, if he wished, the right to sell him to any other factory owner.
He learned quickly not to bring on the wrath of the factory owner. If he made mistakes, fines were added to the sum owed by his parents.