Which dialect survey, conducted between 1950 and 1961 by Harold Orton and Eugen Dieth, systematically recorded traditional dialects across rural England?

• A Survey of English Dialects ✓
• B Linguistic Atlas of England
• C English Dialect Dictionary
• D British National Corpus

The Survey of English Dialects interviewed elderly speakers in 313 localities, preserving vocabulary and pronunciations that have since largely disappeared from everyday use.