Answer:
A.
Step-by-step explanation:
The first railroad to enter the Indian territory was the Atlantic and Pacific. The Atlantic and Pacific railways entered the Indian territory through the Pierce Line as far as Vinita.
In 1870s, the Missouri-Kansas-Texas railways (a.k.a Katy or MKT) crossed the Red River in Texas. Both the railways, the Atlantic and Pacific railways and the Katy railways met at Vinita.
The Atlantic and Pacific railways is the predecessor of the St. Louis and St. Fransico railways (nicknamed 'Frisco'). The railways later formed branches in the north and the south.
So, the correct answer is option A..