Reading Comprehension

The sole use and sole object of existence is enjoyment or pleasure, which two words will
here be treated as synonymous; happiness, also, though not quite identical in meaning,
being occasionally substituted for them. Enjoyment, it must be observed, is of various
kinds, measures, and degrees. It may be sensual, or emotional, or imaginative, or
intellectual, or moral. It may be momentary or eternal; intoxicating delight or sober
satisfaction. It may be unmixed and undisturbed, in which case, however short of
duration or coarse in quality, it may in strictness be called happiness; or it may be
troubled and alloyed, although of a flavour which would be exquisite if pure, and if there
were nothing to interfere with the perception of it. Understood, however, in a sufficiently
comprehensive sense, enjoyment or pleasure may be clearly perceived to be the sole
object of existence. The whole value of life plainly consists of the enjoyment, present or
future, which life affords, or is capable of affording or securing. Now, the excellence of all
rules depends on their conduciveness to the object they have in view. The excellence of
all rules of life must, therefore, depend on their conduciveness to the sole object which
life has in view, viz., enjoyment. But the excellence of rules of life, or of conduct or
modes of acting, would seem to be but another name for their morality, and the morality
of actions obviously depends on their conformity to moral rules. Whence, if so much be
admitted, it necessarily follows that the test of the morality of actions is their
conduciveness to enjoyment.

1) What is the main purpose of the author in writing the passage?
A. To define a term by giving examples
B. To put forward a point of view and explain its implication
C. To describe several interpretations of a belief
D. To present an unusual interpretation of a well known fact
E. To evaluate two competing beliefs

Pls explain your reasoning for each option