What is the science behind this? Is it not obvious that most people want to pick a single alternative? And for precision. If you force people into ranking. Is i

What is the science behind this? Is it not obvious that most people want to pick a single alternative? And for precision. If you force people into ranking. Is it not obvious that the effort that goes into picking the top alternative is much higher than for let us say the fifth option. Basically, adding noise that may skew the results.