The goal that the announcement reflects is C. promoting the general welfare
A goal of the United States government is to act in such a way that contributes to the welfare of all without them necessarily having to pay for it.
A cancer research plan is good for the people as it would help treat those with cancer which is a disease that anyone can get. In planning how to treat it therefore, the president is providing for everyone's general welfare.
Other examples of providing for the general welfare include:
In conclusion, the President is contributing to the general welfare by announcing cancer research.
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The announcement in question is:
"the president announces a new plan for cancer research"