Max has allocated $100 toward meats for his barbecue.His bud

Max has allocated $100 toward meats for his barbecue.His budget line and an indifference map are shown in the above figure.
What happens if Max's mother gives him 30 pounds of burger?
a.Max would have preferred receiving the dollar-value of the burger.
b.Max is indifferent between this gift and the dollar-value of the burger.
c.Max prefers this gift to the dollar-value of the burger.
d.None of the above.
What happens if Max's mother gives him 10 pounds of burger?
a.Max would have preferred receiving the dollar-value of the burger.
b.Max is indifferent between this gift and the dollar-value of the burger.
c.Max prefers this gift to the dollar-value of the burger.
d.None of the above.
对不起,我贴不了图,我把图描述一下很简单,横轴是pounds of burger,纵轴是pounds of chicken.Bugdet constrain 那条直线交横轴于25（说明Price of burger=4),交纵轴于20（说明chicken price=5),indifferent curve切budget constraint于（12.5,10),说明此点为optimal point.
另外,如果demand curve是完全horizontal的话,是不管价格多少consumer surplus都是0 还是consumer surplus取决于价格的大小(也就是说取决于价格是在那条水平demand curve之上或者之下）?