Suppose That Researchers Genetically Modified Mice Such That Dentate Gyrus

Suppose that researchers genetically modified mice such that dentate gyrus (DG) neurons would turn off in response to yellow light. If those mice were subjected to fear conditioning only in one context (context A) but not another (context B) , which of the following would be true?

A) Mice in context A would never show a fear response.
B) Mice in context B would show a fear response when the DG was exposed to yellow light.
C) Mice in context A would not show a fear response when the DG was exposed to yellow light.
D) Mice moved from context A to context B would show a fear response.