In subsistence farming, people generally grow a]only enough to feed their families b]cash crops that command high prices c]crops that are shipped to other countries d] dairy products for city dwellers

Ascientist is explaining how background cosmic radiation gives evidence of the big bang theory. she says that radiation has been detected everywhere equally as heat in the universe and is increasing. this has been shown to be residual radiation from the big bang. what error did the scientist make?