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Premise: Divorce increased since 1940
Conclusion: Number of single-natural-parent kids should have increased.
To weaken teh conclusion, we should either prove that the negative (prove that the kids stay with both parents after divorce) or prove the alternative cause (prove that the alternative cause for single-natural-parent kids have decreased, thereby nuetralising the effect).
E does the second one. If E is true, no. of single-natural-parent kids are not necessarilly greater than 1940
E says D/M has relationship to Cd/(Cm+Cs) (where Cd=Children raised by one of the Divorced parents, Cm=Children raised by Married parents both of whom are alive and Cs is Children raised by single parent(wherein one parent is dead)). If Cs is decreased the ratio D/M will increase.