Question 1144078
B) 1

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x mod 7 = 1
(3x - 2) mod 7 = ((3x) mod 7) - (2 mod 7) = (3 mod 7) - (2 mod 7) = (3 - 2) mod 7 = 1 mod 7

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Spot check: 
 8 mod 7 = 1,  (8*3 - 2) mod 7 = 22 mod 7 = 1 
 36 mod 7 = 1, (36*3 - 2) mod 7 = 106 mod 7 = 1 
 22 mod 7 = 1, (22*3 - 2) mod 7 = 64 mod 7 = 1