The salivary glands of cockroaches occur in pairs and the ducts from each gland usually join to form a single common duct that opens into the oral cavity at a single orifice.
Even though the glands originate in the labial segment, the orifice usually occurs behind or on the hypopharynx and the glands often extend back into the thorax and even as far back as the abdomen.
Therefore, the correct answer is option A.
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