What primarily set off large-scale migration flows among European countries during the twentieth century? A. The ability to establish distinctive political structures
B. The familiar cultural traditions of the host countries
C. The motivation to reach quotas set by individual countries.
D. The desire to reunite with family members who migrated previously
E. The removal of migration restrictions

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.

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the answer is d read the article