Amiri wants to improve her variable skill of shooting a basketball from different places on the court. Research data suggests that which of the following is the least effective way to practice?
a) she should shoot all practice shots from one location, such as the foul line.
b) she should shoot from many different locations, but shoot a group of shots from one location before switching to another location.
c) she should shoot all practice shots from a small number of different locations.
d) all of the others are not particularly effective.

Variable skill can be defined as a skill practised in various different contexts. It is known as variable practice which helpsa learner to acquire skills, experiencing every range of situations in which technique might be used. Acquisition of this skill helps the learner to adapt and develop skill to every possible instances. This practice is vital for open and interactive skills.

In the given instance, Amiri, who wants to improve her variable skills, the least effective way to practice basketball as per the research will be shooting all practice shots from one location, for instance foul line. By practising shooting all shots from one place will be least helpful for her, for acquiring variable skills, as it requires practising from every range of situations.

Therefore, option A is correct.