Total utility implies the total satisfaction that a consumer derives from consumption of all units of a good.
So, total utility can be thought of as the total satisfaction derived from a bundle of goods.
Hence, the correct answer is the option (a).
There exists an important relationship between marginal utility derived from consumption of an additional unit of a good and average utility derived from the consumption of all units of good upto that point that average utility is always greater than the marginal utility.
In other words, the marginal utility of a unit of good X is always less than the average utility of X.
Hence, the correct answer is the option (b).
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