Choice B is the best answer because it correctly uses an apostrophe to indicate the possessive and doesn’t introduce any unnecessary punctuation.

Choice A is not the best answer because, while it correctly indicates the possessive relationship between “transportation planner” and “job,” it introduces an unnecessary comma after the word “job.”

Choice C is not the best answer because it doesn’t indicate the possessive relationship between “transportation planner” and “job,” and it introduces an unnecessary comma after the word “job.”

Choice D is not the best answer because it doesn’t indicate the possessive relationship between “transportation planner” and “job.”