What is the unit digit of 3^58?  Pick
A) 0 B) 5 C) 7 D) 1 E) 9

Rationale: "unit digit in 3 ^ 58 = unit digit in [ ( 3 ^ 4 ) ^ 14 ] * 3 ^ 2 = 1 * 9 = 9 answer is e"
Answer: E