Answer:
b. Acronymic abbreviation.
Step-by-step explanation:
Acronym is the use of the first letter of each word while an abbreviation is the shortened form of a given words in a sentence.
Considering the given acronym ROYGBIV, they stand for a specific name of colors that make up the colors of the rainbow.
R-Red
O-Orange
Y-Yellow
G-Green
B-Blue
I- Indigo
V-Violet
The whole acronym also stands for an abbreviated word. Thus, the correct answer for the given option is acronymic abbreviation.