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 < y < 0, which of the following must be true?

Option A: 2xy/3x is a negative integer

Option B: x-y is a positive integer

Option C: (-x

Option D: x/y is a negative integer

Option E: 2x+y is a negative integer
Option C

Question: Simplify: 250 x 250 - 100 x 100

Option A: 761200

Option B: 761400

Option C: 52500

Option D: 761500

Option E: None of them
Option C

Question: 12 spheres of the same size are made from melting a solid cylinder of 16 cm diameter and 16 cm height. What is the diameter of each sphere?

Option A: 4 cm

Option B: 6 cm

Option C: 8 cm

Option D: 10 cm

Option E: 12 cm
Option C