Final answer:
A 75-year-old retired teacher is most likely to vote in a U.S. presidential election due to higher political activity and community involvement among senior citizens, contrasting with lower voter turnout in younger demographics.
Step-by-step explanation:
Of the individuals listed, a 75-year-old retired teacher is most likely to vote in the presidential election in the United States. Voting behavior varies by several factors including age, education level, and income. Studies have shown that senior citizens have higher turnout rates compared to younger people. A 75-year-old is more likely to be politically active and to have a stable community presence, which correlates with a greater likelihood of voting. Additionally, upon retirement, individuals may rely more on government programs, influencing their participation in the electoral process.
On the other hand, a 16-year-old student cannot legally vote, a 22-year-old college dropout may be less likely to vote due to a variety of factors such as moving frequently or feeling disconnected from politics, and while a 30-year-old working professional may vote, they are statistically less likely to do so than elder citizens.