核心名词与形容词辨析 — 英语阅读题

Read the following passage and answer the question. Last semester, our university library introduced a new online reservation system. At first, many students complained that the website was confusing and that help from the staff was not easily ____ during peak hours. However, after the library hired more assistants and simplified the interface, the situation changed remarkably. Now, every student has free ____ to all digital journals from any campus computer, and a ____ number of study rooms can be booked in advance. The library director said the improvements were made after carefully ____ students' feedback collected over three months. Question: Which set of words correctly completes the four blanks in order? A. available / access / considerable / assessing B. accessible / assess / considerable / access C. available / assess / considerate / accessing D. availability / access / considerable / assessed