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D. 1
The statement `printf (“%d”, 10 ? 0 ? 5 : 1 : 12);` uses the ternary conditional operator, which works as `condition ? result_if_true : result_if_false`. This operator can be nested, as seen in the statement.
Here is how the expression is evaluated:
1. The condition `10 ? 0 ? 5 : 1 : 12` starts with the first condition `10`, which is true (in C and similar languages, any non-zero value is considered true).
2. Since 10 is true, it evaluates the next part of the expression after the first `?`, which is `0 ? 5 : 1`.
3. This can be seen as a nested ternary operation. Here, the condition is `0`, which is false. Therefore, it chooses the result after the `:`, which is `1`.
So, the expression simplifies to `printf(“%d”, 1);`.
Therefore, the statement will print `1`.