Even though many local residents disagree with the decision, the town council has ordered
that the downtown parking rules be changed and a new parking garage built."order" is one of those verbs (think, say,...) that require "that" in 99% of the cases. To understand the cases in which is not necessary consider the following case
Paul says that (something); Paul says "(his words)". So out B.
C stands out because uses "should". If you decide on something, your decision will not be expressed by "should ": your decision "is" not "should be". Out C
Lets analyze A D E together:
A. that the downtown parking rules be changed and a new parking garage
built.
D. that the downtown parking rules be changed and a new parking garage
to be built.
E. that the downtown parking rules be changed and a new parking garage
is built.
Their only difference is the final verb. To pick the correct one we must mantain the parallelism:
be changed and (...) A)
build D)
to be built E)
is builtA mantains the structure. A is correct