Cohort effects pose a problem for research designs. a) longitudinal b) simultaneous c) cross-sectional d) cross-sequential

I believe its C. Cross-sectional

The correct answer is Cross-sectional

Explanation:

When we talk about Cross-sectional research design, we know that participants are studied repeatedly at different ages, and changes are noted as they get older. In a Cohort effect, there are specific experiences influence some children but not others in the same generation. So, there is a problem with Cross-sectionalresearch design in the cohort effect.

hello,

answer: a federal government has final authority on interstate/inter provincial  and international affairs, a confederation is one where the central/national government or authority is governing body what does not have final say over the same matters. hopefully this and i will try again if you don't like this answer : )

best of luck!