The correct answer to this open question is the following.
Although there are no options attached, we can say that the major factor in spurring on Iran's development of nuclear weapons in the 1980s was the victory of the Revolutionary forces in Iran, that overthrew the Shah, the last one that ruled over Iran. So in 1981, after the civil war ended, Iran authorities decided to continue the development of nuclear weapons as a way to defend the sovereignty of the country. In that time, the Soviet Union decided to support Iran sending expert scientists to help Iran to develop its own research program.
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Answer: The Framers of the Constitution gave the President the power to veto acts of Congress to prevent the legislative branch from becoming too powerful. The veto allows the President to “check” the legislature by reviewing acts passed by Congress and blocking measures he finds unconstitutional, unjust, or unwise.
