Final answer:
The sentence that best expresses a message of hope to the audience in President Reagan's speech is: 'We're a people who can face problems head-on and overcome them.'
Step-by-step explanation:
The sentence that best expresses a message of hope to the audience in President Reagan's speech is: 'We're a people who can face problems head-on and overcome them.' This sentence conveys the idea that despite the challenges, the American people have the strength and determination to overcome any obstacles they may face. It instills a sense of optimism and resilience in the audience, inspiring them to persevere and have hope for the future.