Short Answer 
An assumption in literature is a belief taken for granted that influences how readers interpret narratives. The statement that improved labor standards, economic achievement, and social security may not always be attainable reflects this assumption, validating the need for critical analysis in understanding literary arguments. The correct option A aligns with the conditional nature of these factors, highlighting the importance of recognizing underlying assumptions in literature.
Understanding Assumptions
An assumption in literature refers to a belief or statement taken for granted without needing proof or verification. It forms the foundation of arguments or narratives, influencing how readers perceive the circumstances presented by the author. This understanding is crucial as it helps clarify the context surrounding various claims in literary works.
Identifying the Statement
The statement in question highlights that improved *labor standards*, *economic achievement*, and *social security* may not always be attainable. This is an assumption because it operates on the premise that these positives are conditional and not guaranteed outcomes. Recognizing this helps in assessing the logical structure of arguments made in literature.
Choosing the Correct Option
Given the nature of the assumption, the correct option for the question is A. This option aligns perfectly with the idea that the mentioned factors are not universally probable, reinforcing the necessity for critical analysis of stated assumptions in literary texts. Always look for how main themes are shaped by underlying assumptions when reading or evaluating literature.