Which Grade is the Highest?

Donovan has the following grades in math class:

74, 78, 88, 90, 90, 90, 90, 93, 97, 100

The teacher gives students the following options for determining their grade:

a) You can drop your highest and lowest grade and your grade will be the mean of the remaining scores

b) Your grade will be the mode of all of your scores

c) Your grade will be the mean of all of your scores

Find Donovan's grade for all three scenarios. If you were Donovan which scenario would you choose? Why?