what is the output of following in javascript var input 12 51km..., Function, Javascript

Question:What is the output of the following in JavaScript?var input="12.51km";
length=parseFloat(input);
document.write(length);

A 12.51km 
B 12km 
C 12.51 
D 12

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Question:What is the output of the following in JavaScript?var input="12.51km"; length=parseFloat(input); document.write(length);