Final answer:
Without specific details on the seventh chord in question, such as its notes or position on a musical staff, it is impossible to match the chord to a chord symbol accurately.
Step-by-step explanation:
To determine which chord symbol matches the seventh chord mentioned, we would need additional information about the chord itself, such as the notes it contains or its position on a musical staff. Without this information, it is not possible to accurately match the chord to one of the lettered choices (A, B, C, or D). In musical theory, a seventh chord includes a root note, a third, a fifth, and a seventh. The specific type, such as major, minor, diminished, or dominant, depends on the intervals between the notes.
For example, if the given seventh chord comprised the notes C, E, G, and B♭ (flat), it would be a C minor seventh chord, often written as Cm7 or C-7. To accurately determine the chord symbol, one should reference the actual notes or sheet music provided, as in the excerpt from J.S. Bach in Figure 7.1.1, or apply music theory knowledge to identify the chord structure.