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.

[EX Q]: Question: Sum of 19 odd numbers is?

Option A: 341

Option B: 351

Option C: 361

Option D: 371

Option E: 381
[EX A]: Option C

[EX Q]: Question: A train covers a distance of 12 km in 10 min. If it takes 10 sec to pass a telegraph post, then the length of the train is?

Option A: 100

Option B: 110

Option C: 200

Option D: 130

Option E: 140
[EX A]: Option C

[EX Q]: Question: Q is as much younger than R as he is older than T. If the sum of the ages of R and T is 50 years, what is definitely the difference between R and Q's age?

Option A: 23

Option B: 28

Option C: 25

Option D: 19

Option E: 11
[EX A]:
Option C