Final answer:
The number 007 defined as an integer in C is an octal number. When displaying with printf using %d, it will be shown as the decimal value 7, ignoring leading zeros.
Step-by-step explanation:
When you declare an integer in C programming with a leading zero like int x = 007, this indicates that the number is in octal (base 8) format. However, in the printf statement, the format specifier %d displays the integer value in decimal (base 10) format. Therefore, the leading zeros do not affect the value of the variable and it will be displayed in decimal.
The correct answer is, therefore, a. 7. The program will output the decimal equivalent of the octal number 007, which is just 7 in decimal.