As you read the fiction selection: "The Landlady" you came across a middle-aged Landlady woman who welcomes everyone with a warm smile. As the story proceeds, you notice some strange things for instance "her small white, quickly moving hands, and red fingernails." Now take a look at Billy's character. What would you have done differently?

3 is blunder, i’m not sure about the last one but the first two look correct

a.) or b.) but i think a.)

explanation:

a constant variable, normally called a controlled variable, is the term for a variable that remains constant throughout an experiment, though other variables may change. an example is the water pressure for a faucet when measuring the amount of water released when the faucet is opened to various increments.