√289 - √625 ÷ √25 is equal to ?	Choose the correct choice
A) 17 B) 15 C) 12 D) - 8 / 5 E) none

Rationale: answer √ 289 - √ 625 ÷ √ 25 = √ 17 x 17 - √ 25 x 25 ÷ √ 5 x 5 = 17 - 25 ÷ 5 = 17 - 5 = 12 correct option : c
Answer: C