which of the declaration is correct, Variables & Datatypes, C Language

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Question:Which of the declaration is correct?

A int length; 
B char int; 
C int long; 
D float double;

+ AnswerA

+ Explanationint length; denotes that variable length is int(integer) data type.

char int; here int is a keyword cannot be used a variable name.
int long; here long is a keyword cannot be used a variable name.

float double; here double is a keyword cannot be used a variable name.

So, the answer is int length;(Option A).

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