When Koko the Koala is awake, he eats $84$ grams of leaves per hour. He was awake for $2$ hours yesterday and $10$ hours today. How many grams of leaves did he eat in total in the two days? (adapted from 2014 Math Kangaroo Problem, Level 3-4, Question \#4) 
选项为:A:$$840$$  B:$$168$$  C:$$672$$  D:$$1008$$  请回答其中一个选项.