Select the best version of the underlined part of the sentence. The first choice is the same as the original sentence. If you think the original sentence is best, choose the first answer.
(A key factor taken into account during city planning is) where major services and amenities will be located.
a. A key factor taken into account during city planning is
b. Key factors, taken into accounting during city planning are
c. Key factors taken into account during city planning is
d. A key factor taking into account during city planning is