A. Speed up so you're not holding them up
A. Speed up so you're not holding them up
B. Give them the opportunity to pass by moving left, if appropriate
C. Hold your line
D. Increase the distance between you and any vehicle ahead
While pulling to the left is the obvious thing to do you should also assess your own riding. Are you holding drivers and other riders up? Why would this be?
If you are a novice rider it is understandable that you would be riding slower than more experienced riders and drivers. Once you have more experience if you find that your natural speed is a little slower than everyone else's, simply get into the habit of letting people past.
If you find when you get more experience that you daren't go faster, then perhaps more training will give you the confidence and skills. Ultimately it's your responsibility to ride at a speed that is comfortable for you, but without unduly holding up other traffic.
Note that you can be fined for driving too slowly and holding up traffic.