Answer:
O A.
Explanation:
Rhythm is music's pattern in time. Whatever other elements a given piece of music may have (e.g., patterns in pitch or timbre), rhythm is the one indispensable element of all music. ... In music that has both harmony and melody, the rhythmic structure cannot be separated from them.
I am pretty sure it is d. i hope that pelped
Line conventions............lines can only be thick or thin. Thick is 0.6mm and thin is 0.3mm.