Could someone help with this question

B.

Step-by-step explanation:

A linear function refers to two distinct but related notions: In calculus and related areas, a linear function is a function whose graph is a straight line, that is, a polynomial function of degree zero or one. Which means that a linear function would be a "straight line."

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First yellow is y-1 the third yellow will be y-3

Second Blue will be b2

The first green will be g-2 and the fourth green will be g-4

Step-by-step explanation: It's legit just going by the color but instead of saying the full color they use the first letter and then just goes up by 1 each time. That's what I think the answer would be.