Select the sentence that does not contain a grammatical error.
A. His behavior had been irresponsible and unbelievabley childish.
B. His behavior had been irresponsable and unbelievably childish.
C. His behavior have been irresponsible and unbelievably childish.
Correct Sentence: His behavior had been irresponsible and unbelievably childish.
Complete the following task based on the instruction and optional input provided.### Instruction:
Select the sentence that does not contain a grammatical error.

### Input:
A. His behavior had been irresponsible and unbelievabley childish.
B. His behavior had been irresponsable and unbelievably childish.
C. His behavior have been irresponsible and unbelievably childish.

### Output:
Correct Sentence: His behavior had been irresponsible and unbelievably childish.