The resolution which is most efficient for sending theses files (pictures) through an email is: B. 72 dpi.
What is a resolution?
A resolution can be defined as the number of pixels that are contained in an image (picture) or on a display monitor.
In Computer science, a resolution is typically expressed as a function of the number of pixels on both the horizontal axis and vertical axis.
This ultimately implies that, the resolution of an image (picture) determines its quality and sharpness.
In conclusion, Allison should send the pictures from the dance competition to her friends by using a resolution of 72 dpi.
Read more on resolution here: https://brainly.com/question/14294025
