20 points , english question A "notes" margin is sometimes used in books. This special type of page formatting achieves the following results. Which is its primary purpose?

a) adds lots of white space to text-heavy material
b) provides a location for pull-quotes
c) gives a place for note-taking
d) makes the book longer

Read the passage. (1) the first skateboard was constructed of old roller-skate wheels attached to a piece of wood. (2) improvements were made to the skateboard in 1959. (3) the year that the first commercially made skateboard appeared. (4) soon after, skateboarding began to grow in popularity. (5) in 1963, skateboard manufacturers formed the first professional skateboarding team. (6) that same year, the first organized skateboard competition took place, in california. which is the most effective way to correct the fragment in sentence 3? attach the fragment to sentence 4. attach the fragment to sentence 2. insert the phrase in the united states to the end of the fragment. insert the verb had before the verb appeared.