The ratio of granola and penuts si 1:4, this means that for each once of peanuts there will be 4 ounces os granola so in a total of 20 ounces we will have:
and the sum of 16 plus 4 is equal to 20 so we have 4 ounces of peanuts and 16 ounces of granola
So the answer is D 16 ounces of granola