The responsibilities held by the federal government among the options provided are:
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Protecting national parks - This is a federal responsibility, as national parks are managed by the National Park Service, which is part of the Department of the Interior.
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Administering healthcare - The federal government has a role in administering certain healthcare programs, such as Medicare and Medicaid, as well as regulating healthcare policies.
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Providing Social Security - This is a federal responsibility, as Social Security is a federal program designed to provide financial assistance to retirees, disabled individuals, and survivors.
The other options (managing intercity traffic, creating garbage collection services, and chartering city governments into existence) are typically handled at the local or state level rather than by the federal government.
So, the correct answers are: 1, 2, and 3.