Her gaze was a laser to his heart

this metaphor means that
a-grandmother was trying to scare him
b-grandmothers stare made him feel guilty
c-grandmothers look gave him a heartburn
d-grandmother stared directly at his chest

1-b

3 answers

Yes, I agree.
doesnt c give a meaning to
It could. It's hard to tell without seeing the sentence in a larger context.