It’s B. Sahara Desert is the largest, so A is incorrect. Japan isn’t where Gobi Desert stretched to, so C is wrong and, Korean Peninsula is same as Japan, where Gobi Desert doesn’t stretch to. Hope this will help.
I think the answer is 80 because if he makes 20 loaves of bread each morning, and 10 more every half an hour for three hours ( 20 + 60 = 80) the answer should be 80. Correct me if I'm wrong please, Thank You!