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Resistance wire strain gauge works on the principle

[A].	That resistance chanes in proportion to strain on material	[B].	That resistance of wire changes with load
[C].	That conductivity is directly proportional to load on member	[D].	Due to elongation length increases and diameter reduces, thereby resistance changes
[E].	That the resistance of a wire is directly proportional to diameter and inversely proportional to length

Answer: Option D