Secretly is to openly as silently is to

The correct answer is D. quietly.

Secretly means in a way that is not known to other people. Openly means in a way that is known to other people. Silently means in a way that does not make any noise. Quietly means in a way that is not loud.

Scarcely means almost not at all. Impolitely means in a way that is not respectful. Noisily means in a way that makes a lot of noise.

The answer D. quietly is the best choice because it is the closest antonym of the word “silently.” The other options are not as close in meaning.