A, b and d are all correct answers
The key element in making computers widely accessible to the public was by reducing the size and cost by using silicon chips to store data. The correct option among all the options that are given in the question is the second option. People could buy personal computers as it became cheaper and more available in the market.

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D. Government.
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The answer to this question mentioned above is "Federalism".
The fact that Southern juries generally did not convict those accused of murdering of African-Americans and civil rights workers illustrates one of the problems associated with America's constitutional provision for FEDERALISM.
Answer: From the Green Movement in Iran to the Arab Spring to the continuous struggle of Chinese dissidents, social media have gained a prominent place in foreign policy research, as they have considerably influenced world events.
Explanation: