Final answer:
The Republican Party platform typically includes reducing the size of government, advocating for smaller government, less regulation, and lower taxes for businesses and the wealthy.
Step-by-step explanation:
Out of the options provided, reducing the size of government would be part of the Republican Party platform. Historically, the Republican Party has advocated for smaller government, less regulation, and lower taxes, particularly for businesses and the wealthy.
For example, during the 2016 presidential campaign, Republican candidates like Ted Cruz and John Kasich signed pledges not to raise taxes. Moreover, Republican-led Congresses have frequently introduced legislation aimed at reducing taxes, cutting government spending on social programs, and, at times, increasing military spending.