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= pleasure
both = pleasure
however, not always the above statement for happiness
pleasure = happiness
pleasure
different happiness
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;The whole value of life plainly consists of the enjoyment, present or future, which life affords, or is capable of affording or securing.From the above equalities and statements
(A) Pleasure always leads to happiness.
(B) Pleasure can be of different types.
Yes: sensual , emotional and blah blah blah
(C) Enjoyment is no different from pleasure.
Yes
(D) Unmixed enjoyment cannot strictly be called enjoyment.
yes. it can be unmixed or not
(E) The sole purpose of life is the quest for happiness.
Yes. last sentence I reported: the whole value of life
A is no where stated in the passage and therefore is the correct answer
I hope this helps