One of the Hindrances Holding Back Trafficked Children and Women

One of the hindrances holding back trafficked children and women is that they are "innumerate," which makes it difficult for them to keep track of their business. What does this mean?

A) They have never been taught to count.
B) They have never been taught to read.
C) They have never been taught to speak languages, other than the ones they knew in their countries of origin.
D) They have been sterilized before they were trafficked and can never have children of their own.