Among the following options, the correct integer constant in C language is a.32lb.510000c.1.00d.567.

D.567 is correct. Your topic is an old compiler topic. Integer refers to short integer, so it is correct.

C. is a floating point number.

B. Your topic is an old compiler topic, so the numerical range of 5 10000 is out of bounds.

A.32L is a long integer, and your topic is an ancient compiler topic. Integer refers to a short integer, so it is wrong.

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Today's compilers think that A, B and D are all correct integer constants. C. is a floating point number.