Answer:
A. conjunct motion/step motion.
Explanation:
Conjunct motion is better for vocal music. Conjunct means a step between two pitches. it is the gap (definite) between two consecutive notes. If the gap or interval is larger then it is called a disjunct motion or skip (leap). Conjunct motion is the difference in pitches between two continuous notes.
A musical staff is a staff with a set of five horizontal lines and four spaces that each represent a different pitch