Motor aphasia refers to defect in:

Answer is B (Verbal expression): Motor aphasia also known as expressive aphasia is a disorder of thought and word finding resulting in inadequate verbal expression. * Defect in hearing: Deafness * Defect in understanding: Receptive aphasia / Sensory aphasia * Defect in thought and word finding: Motor / Expressive aphasia * Defect in voice production: Dysphonia * Defect in aiculation: Dysahric