Step 1: Question Interpretation.
The inquiry pertains to a linguistic and historical investigation concerning Tibeto–Chinese civilizations, their trade routes, and associated language families, specifically focusing on the trans-Gangetic and Sino-Tibetan geographical areas.
Step 2: Identification of the Correct Work.
The publication *Ueber Herkunft und Sprache der transgangetischen Volker, Vol. I* (translated as “On the Origin and Language of the Trans-Gangetic Peoples”) examines the linguistic and ethnographic interconnections among Tibeto–Chinese populations and other Asian linguistic groups.
Step 3: Evaluation of Options.
- (1) *Periplus of the Erythraean Sea*: A document detailing maritime trade, it lacks relevance to linguistics.
- (2) *Linguistics Survey of India Vol. 1*: Focuses on Indian languages, not directly addressing Sino–Tibetan origins.
- (3) *Ueber Herkunft und Sprache der transgangetischen Volker, Vol. I*: Correct; its scope encompasses the linguistic and ethnic origins of Tibeto–Chinese peoples.
- (4) *Lexigo Statistic Dating of Boro–Garo Linguistic Separation*: A contemporary statistical study, not the classical text in question.
Step 4: Determination.
Consequently, the correct selection is (3) *Ueber Herkunft und Sprache der transgangetischen Volker, Vol. I*.