OR logic is formed by which arrangement?

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OR logic means the output turns on if any one input is active. Wiring two normally open contacts in parallel creates exactly that: each contact represents an input path to energize the load. When an input is activated, its normally open contact closes and completes its branch, so current can flow to the output. If either path closes, the circuit is completed and the output is energized. If neither input is active, both contacts stay open and no current flows.

This arrangement fits OR because it doesn’t require both inputs to be true; it only requires at least one to be true. Other configurations don’t produce the same behavior: a single normally open contact is just one input, not a true OR of multiple inputs; two normally closed contacts in series would only close when both inputs are inactive (inverse behavior); and a normally closed contact in parallel with a normally open contact would provide a continuous path through the closed contact and not reflect the intended OR condition.