A horse with a long shoulder and forearm will most likely have which of the following?

A horse with a long shoulder and forearm is typically designed for an efficient range of motion in its front legs. This conformation allows for greater length in the stride, which translates to a long, ground-covering stride. A longer shoulder and forearm can enhance the horse's ability to move fluidly and reach forward effectively, contributing to better performance in various disciplines.

In contrast, shorter strides are often associated with a lack of reach or mobility, which would not be expected when a horse has the conformation of a long shoulder and forearm. Moreover, a slow gait or uneven trot is generally the result of other conformational issues or physical limitations, rather than the specific characteristics of a long shoulder and forearm. Thus, the horse's anatomical features directly support the ability to achieve a long, efficient stride.