Does secondhand smoke increase the risk of a low birth weight?

Does secondhand smoke increase the risk of a low birth weight? A baby is considered have low birth weight if he/she weighs less than 5.5 pounds at birth. According to the National Center of Health Statistics, about 7.8% of all babies born in the U.S. are categorized as low birth weight. Suspecting that the national percentage is higher than 7.8%, researchers randomly select 1,200 babies whose mothers had extensive exposure to secondhand smoke during pregnancy and find that 10.4% of the sampled babies are categorized as low birth weight. Let p be the proportion of all babies in the United States who are categorized as low birth weight. What are the appropriate null and alternative hypotheses for this research question?

A. H 0 : p = 0.078 H a : p ≠ 0.078

B. H 0 : p = 0.078 H a : p > 0.078

C. H 0 : p = 0.104 H a : p ≠ 0.104 D.