Which option correctly identifies the mast arm or sidewalk guy?

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Understanding how streetlight and sidewalk installations are stabilized helps make sense of this term. A mast arm extends from the pole to hold a fixture, like a streetlight, and it needs a stabilizing wire to resist sideways movement and wind loads. The specific wire that does this for a mast arm or sidewalk-mounted setup is called the mast arm guy or sidewalk guy. That label directly identifies the component whose job is to keep the mast arm steady, which is exactly what the question asks for.

Other terms aren’t used for this particular stabilizing component: a span guy generally refers to a guy wire used along a span of lines, not specifically for a mast arm; a head guy and a push guy aren’t standard names for the stabilizing setup on a mast arm. So the precise term that describes the component in question is the mast arm or sidewalk guy.