You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

Question: If x and y are negative integers, which of the following statements must be true?
I. (-x)^y is positive.
II. (-x)^(-y) is positive.
III. x^(-y) is positive.

Option A: None

Option B: II only

Option C: I and II

Option D: I and III

Option E: I, II and III
Option C

Question: Little John had $8.50. He spent $1.25 on sweets and gave to his two friends $1.20 and $2.20. How much money was left?

Option A: $5.85

Option B: $6.85

Option C: $ 3.85

Option D: $2.85

Option E: $4.85
Option C

Question: At a special sale, 12 tickets can be purchased for the price of 3 tickets. If 12 tickets are purchased at the sale, the amount saved will be What percent of the original price of the 12 tickets?

Option A: 20%

Option B: 33.3%

Option C: 40%

Option D: 50%

Option E: 75%
Option E