What was the origin of the name 'River Plate' for the club?

A. It was named after the English name for the Río de la Plata, which was seen on boxes during the construction of Buenos Aires Port
B. It was named after the merge of the two founding clubs, 'Santa Rosa' and 'La Rosales'
C. It was named after the La Boca neighborhood where the club was founded
D. It was named after the founder's favorite river
Answer: 