Final answer:
To add notes a diatonic half step above in the bass clef, you should raise the note by one half step.
Step-by-step explanation:
To add notes a diatonic half step above in the bass clef, you should choose option C) By raising the note by one half step. A diatonic half step, also known as a semitone, is the smallest interval in the Western tonal music system. In musical notation, moving a note a half step can be achieved by using an accidental, such as a sharp (♯) to raise a natural note by a half step, or a flat (♭) to lower it. When adding notes above the original pitch, if the note needs to be raised to achieve a half step, you would generally use a sharp unless the note is already a flat, in which case you might use a natural sign to raise it a half step.
Your explanation is accurate. When adding notes a diatonic half step above in the bass clef, the correct choice is C) by raising the note by one half step. In music notation, a diatonic half step, or semitone, is the smallest interval. To achieve this interval, you use accidentals like sharps (♯) to raise natural notes or naturals (♮) to cancel a previous sharp or flat. If the original note is already a flat, using a natural sign raises it by a half step. Therefore, for clarity and adherence to the rules of music notation, when adding notes above the original pitch and aiming for a diatonic half step increase, using a sharp is the conventional choice, making option C the appropriate selection.