Question

the feature, known as the halo — although the correct technical term is frontal cockpit protection device — is a roll - bar structure with a single central strut, made of titanium and weighing 15.4 pounds. source: new york times in this sentence, strut means: apparatus to maintain and control a nuclear reaction brace consisting of a bar or rod used to resist compression magnifier of the image of small objects scientific instrument with displays and an input device

Explanation:

The text describes the "halo" as a roll - bar structure with a single central strut. In structural terms, a strut is a type of brace (bar or rod) used to resist compression, which fits the context of a protective device structure.

Answer:

B. brace consisting of a bar or rod used to resist compression