Dialectology, a sub-field of linguistics that studies variations in a

Dialectology, a sub-field of linguistics that studies variations in a language, began as an effort to produce dialect maps, in which lines were drawn on a map indicating different dialect areas. In the late 1920s, dialectologists became more concerned with social factors and began taking social variation into account in their studies of dialect. This development probably occurred as a result of Structuralist developments in the study of language.

Which of the following statements, if true, would most strengthen the argument?

A. After 1930, linguists no longer considered dialect maps useful in the study of dialect.

B. If not for Structuralist developments in the study of language, psychologists may never have incorporated linguistic factors into their studies.

C. Structuralism in linguistics is an approach that focuses on how the elements of a language relate to each other, rather than how they evolved over time.

D. Some linguists consider dialectology a social science because of its focus on social factors.

E. Though in the 1930s it was still barely known, by the mid 20th century Structuralism was one of the most popular and widespread academic approaches.