Answer: Stemmiulida is more closely related to Merocheta than Penicillata is to Merocheta
Step-by-step explanation:
Your question isn't complete as you didn't attach the picture needed to solve the question but I searched online and got the picture which is attached below.
Therefore, based on this cladogram, the statement best describes relationships among millipede orders is that Stemmiulida is more closely related to Merocheta than Penicillata is to Merocheta.
Therefore, the correct option is A