The best choice for the sentence "At that time, a rudimentary moveable (6) wooden characters would be affixed to wooden panels, rolled with ink, and pressed onto paper." is option A "NO CHANGE."
Option A keeps the sentence in the past tense and maintains the correct structure of the original sentence, indicating that the process of affixing wooden characters to panels took place in the past. The other options ("is intrigued," "had been intrigued," and "was intrigued") do not fit properly in this context because they either change the tense incorrectly or create unnecessary complexity for what is being described.
Therefore, the final choice is:
A NO CHANGE