Mark knows that his reasearch paper will be about solar enrgey. which question is too broad for a topic? a. what is solar energy and how does it effect the world's economy? b. what new technology will make solar energy more affordable? c. how does use of solar energy the environment? d. what are the benefits and difficulties of home use of solar energy?

Read the sentence. marissa heard the class bell ringing loudly walking down the hall. what is the best way to revise this sentence? `marissa heard the hall ringing loudly walking down by the class bell. `marissa heard the class bell walking down the hall ringing loudly. `walking down the hall, marissa heard the class bell ringing loudly. `walking down the hall, the class bell ringing loudly marissa heard.