Sentence Correction

The normative model of strategic decision-making suggests that executives examine a
firm's external environment and internal conditions, and in using the set of objective
criteria they derive from these analyses, can decide on a strategy.
A. conditions, and in using the set of objective criteria they derive from these analyses,
can decide
B. conditions, and they use the set of objective criteria derived from these analyses in
deciding
C. conditions and, in using the set of objective criteria derived from these analyses,
deciding
D. conditions and, using the set of objective criteria derived from these analyses, decide
E. conditions and, in their use of the set of objective criteria they derive from these
analyses, they decide

source:gmat club

i take D because it fits with parallelism

any explanation??