I believe the correct answer is 1) Those who wish to
go to the concert can expect that there will be a limited number of tickets,
that those tickets will go on sale tomorrow, and that they should do some
comparison shopping to get the best price.
Parallel sentence structure represents a repetition
of the same pattern of words or phrases within a sentence to show that two or
more ideas have the same level of importance. It is important to repeat the
words of the same syntactic level, for example you should repeat only a noun or
only a verb etc. In this example, the pronoun that is the word that makes the
parallel structure.
