The museum curator, known for her meticulous attention to detail, insisted that each artifact (a) be (b) handled with the utmost care, (c) preserving its delicate structure (d) and (e) preventing any potential damage.
Correct: A
The subjunctive mood is used after verbs expressing a demand, request, suggestion, or order, such as "insisted." In this case, the subjunctive "be" is used to express the curator's insistence that each artifact be handled with care. The subjunctive form does not change based on the subject, so it remains "be" regardless of whether the subject is singular or plural. Thus, (A) is correct.