The California joint-venture plant that built Toyota’s first U.S.-assembled car was NUMMI.
NUMMI stands for New United Motor Manufacturing, Inc. It was created in 1984 by Toyota and General Motors at a former GM facility in Fremont, California. The partnership gave Toyota a manufacturing base in the United States while allowing GM to learn from Toyota’s production methods, including lean manufacturing and just-in-time logistics.
Toyota’s first car assembled on American soil was a white Corolla FX16, which came off the NUMMI line in 1986. That milestone is why NUMMI is the canonical answer to this question. The plant later produced Toyota models such as the Corolla and Tacoma, as well as GM vehicles including the Chevrolet Nova and Pontiac Vibe.
The abbreviations in the wrong options refer to other Toyota manufacturing operations. TMMK is Toyota Motor Manufacturing Kentucky, TMMC is Toyota Motor Manufacturing Canada, and TMMTX is Toyota Motor Manufacturing Texas. NUMMI ended production in 2010 after GM withdrew from the venture.