The item that received the lowest amount of federal grants in 2017 was most likely Education.
You did not include the graph in question but the amount that a sector receives for grants is usually linked to the amount the sector receives from the US Federal budget.
In 2017, education received the lowest allocation out of these of just 2%. The allocations to the others were:
In conclusion, going by the budget for 2017, education received the lowest allocation out of all of these.
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