Synthetic fabrics are often superior to natural fabrics in that they are: A-better for hot weather.
B-require less washing.
C-hold their shape well.
D-more durable.

D is your answer

Explanation:

it seems to me that yes they solo on the chord changes.  coltrane for sure solos on the chord changes. instead of changing scales, they use a different method over the chord changes. this melody is very  unique but may often times even be considered simple, which is quite common in this modal  type. for example, there are changes from the key of minor to major in this piece, which makes it  unique in its own way.