Final answer:
Melodies can move in any direction.
Step-by-step explanation:
Regarding melodies, the statement that is always true is: c) Melodies can move in any direction. A melody can ascend, descend, or stay on the same pitch, depending on the musical composition and the intended effect of the melody. For example, a melody may start on a low note and gradually ascend, or it may start high and descend. Melodies can also stay on the same pitch for a period of time before moving to a different pitch. Therefore, option c is the correct statement about melodies.