The term 'leaving without a position lined up' directly refers to the act of resigning from a job without having another job arranged or prepared. Option A is incorrect because it implies having a new job before resigning. Option C is incorrect because it suggests careful planning, which is not necessarily implied by the term. Option D is incorrect because it introduces an emergency situation, which is not part of the term's meaning. The correct answer is B, as it directly aligns with the definition of the term.