Read the following excerpt carefully before choosing your answer. This passage is from then-Senator Barack Obama's November 2007 Speech on the "American Dream."

"The steel plant had closed. Jobs were disappearing. In a forgotten corner of America, the American dream was slipping away. And I knew dreams are worth fighting for."

The purpose of including this line at the beginning of his speech is to

build an emotion of hope by creating an image of equality
engage the audience by establishing authority and credibility
add reliability to his argument by quoting experts
establish the need for hope by using concrete examples

The subject option isn't available. the topic is earth science!suppose you are a city engineer whose job it is to explore how to use more renewable energy in your locality. 1. consider the resources in your city and select one of the following: - hydropower -solar power -wind power -geothermal power 2. prepare a pamphlet or multimedia presentation to convince a committee of citizens and local leaders that the renewable energy source you have selected is best for you locality. in your pamphlet or presentation include: - a discussion of the renewable energy source that is best for your town and why -a discussion of the advantages and disadvantages of this energy source -a discussion of why you think your city should use more of this energy source -how the use of renewable energy will impact your city -pictures and/or charts and tables to strengthen your arguments