Transforming functions

Given the graphs of functions f and g where g is a transformation of f, determine the formula of g in terms of f.

Problem

start color redD, g, end color redD is a transformation of start color blueD, f, end color blueD. The graph below shows start color blueD, f, end color blueD as a solid blue line and start color redD, g, end color redD as a dotted red line.
What is the formula of start color redD, g, end color redD in terms of start color blueD, f, end color blueD?
Please choose from one of the following options.
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