How do ideological parties and single-issue parties differ from one another? A. Ideological parties tend to be more liberal, while single-issue parties tend to be more conservative. B. Ideological parties focus on certain beliefs, while single-issue parties focus on one main concern. C. Single-issue parties tend to be more liberal, while ideological parties tend to be more conservative. D. Single-issue parties focus on certain beliefs, while ideological parties focus on one main concern.