Text stimulus (survey instrument table): Survey instrument table titled 'Survey Category Limitation for Partner Households'. Table shows two survey versions. Version 1 categories: married couple, single parent, one-person, other. Version 2 categories: married couple, cohabiting partner, single parent, one-person, other. Example shares for partner households: Version 1 cannot separate cohabiting partner; Version 2 lists cohabiting partner = 8%. The reported data show two survey versions. Version 1 listed married couple, single parent, one-person, and other. Version 2 added a separate cohabiting-partner category, which was 8%. Which conclusion is most careful?