As Part of the Ottawa Language Study Reported by Johnson

As part of the Ottawa Language Study reported by Johnson, Beitchman, and Brownlie (2010) it was reported that:

A) educational attainment was significantly higher for adults in the control group (i.e., no history of speech sound disorder or language impairment) compared to the adults with a history of speech sound disorder only and the adults with a history of language impairment.
B) educational attainment was significantly higher for adults in the control group (i.e., no history of speech sound disorder or language impairment) and adults with a history of speech sound disorder only compared to adults with language impairment (and possible concomitant speech sound disorder) .
C) educational attainment was significantly higher for adults in the control group (i.e., no history of speech sound disorder or language impairment) and adults with a history of language impairment only compared to adults with speech sound disorder.
D) educational attainment was equivalent across the three groups studied: adults with no history of speech sound disorder or language impairment (control group) , adults with a history of speech sound disorder only, and adults with a history of language impairment.