Which of the following is the correct definition for Average speed?

• A. Average speed \[=\frac{\text{total}\,\,\text{displacement}}{\text{total}\,\,\text{time}}\]
• B. Average speed \[=\frac{\text{total}\,\,\text{path}\,\,\text{length}}{\text{total}\,\,\text{time}}\]
• C. Average speed \[=\frac{\text{change}\,\,\text{in}\,\,\text{speed}}{\text{total}\,\,\text{time}}\]
• D. Average speed \[=\frac{\text{sum}\,\,\text{of}\,\,\text{all}\,\,\text{the}\,\,\text{speed}}{\text{total}\,\,\text{time}}\]