In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.

[EX Q]: Aaron Hotchner:  There have been two known copycats .
Penelope Garcia: Correct . The first _ one _ was Heriberto Seda . He killed three and wounded four in New York City . And then , there was a 14-year - old in Japan named Seito Sakakibara . He killed two other children and left the sign of the Zodiac behind .
David Rossi: The fact is the Zodiac was driven by a need for notoriety and control .
Aaron Hotchner: He enjoyed the terror he spread through the city .
[EX A]: copycats

[EX Q]: Lucky:  I know you 're smart , Spot , but how do you handle pressure ? Solve this simple word problem in say , thirty seconds .
Spot: Ah - ha , no problem ! Two trains are heading toward each other , _ one _ at twenty - five miles an hour and the other at forty . They 're fifty miles apart and getting closer on the same track , but with no time to throw the switch , they collide , head on . All aboard perish and it 's all my fault !
Lucky: Next .
[EX A]: trains

[EX Q]: Kris Munroe:  They really do have 18 wheels .
Tiffany Welles: Yep , but the _ one _ we have to worry about is number 19 .
Kris Munroe: Which one is that ?
Tiffany Welles: The steering wheel .
[EX A]:
wheels