Question

his father is .........S.D.O (article)

Answer 1

His father is an S. D. O.

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Answer 2

Answer:

His father is an S.D.O

Explanation:

A, e, i,o, and u are the appropriate vowels. Vowels are formed by the free movement of breath through the larynx and mouth, and are named after the Latin word for "voice" (vox). A consonant sound is produced when the mouth is impeded during speech production, most commonly by the tongue or teeth.

Statement:

His father is ____S.D.O

Answer:

His father is an S.D.O

Because this is clearly an acronym, you would use the indefinite article "an" as in an SDO if speaking in a broad sense.