Their achievement in the field of literature is described as ...............; sometimes it is even called ...............
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When paired words describe contrasting opinions or views, the first word often denotes a more neutral or minimal perspective, while the second one contrasts with it by suggesting importance.
The achievement in literature is described as "insignificant" by some, and at the same time, it is "influential" by others. This suggests that the achievement's importance is debated, making Option (2) the correct choice.
\[
\boxed{2}
\]