I keep trying to solve but my numbers are not adding up please explain step by step.

A 2009 study to investigate the dominant paws in cats was described in Animal Behaviour (Volume 78, Issue 2). The researchers used a random sample of 42 domestic cats. Of the 42 cats studied, 20 were classified as "left-pawed". Construct a 95% confidence interval for the proportion of domestic cats that are "left-pawed". Use three decimal places in your margin of error. O 0.296 to 0.623 0.325 to 0.627 O 0.317 to 0.631 O 0.306 to 0.643