Answer: without fault.
Flawless
Perfect
Faultless
Explanation:
You didn't give the options but let me help out.
The sentence is that "Mr. Howard always wears an impeccable suit to interviews". Impeccable simply means that something that is perfect or flawless.
For example, the statement "John has an impeccable character" simply means that John has a perfect character and is without fault.
