Question

What does the phrase in bold suggest?
Inside the museum archives, Malik discovered a historical document that was a window into another century.
A. The document included a diagram of a beautiful stained glass window.
B. The document provided a view of what life was like during an earlier era
C. The document was written on paper so thin that it was almost see-through.
D. The document was biased, and the motives of its author were highly transparent.

Answer 1

B. It means the document gave Malik a view into life in an earlier era — "window into another century" is a metaphor for revealing the past.