In countries with high rates of poverty and low levels of education there has been a significant increase in the number of young children who have died because of:

Lack of nutrition

Explanation:

There has been a significant increase in the death rate of the young ones because the children born lack nutrition.

The parents are not literate enough to get a good job and due to this reason the there is not enough nutrition provided to the children born.

The family is poor and cannot afford such food and nutrition that is required at such an age.

So, malnutrition is one of the main reason why the young ones died.

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hmmm

true, i think.

i checked and it seems the answer is, true.