When Is Using the Output of the Shiny App "Randomization

Multiple Choice

When is using the output of the Shiny app "Randomization Test for Difference in Two Treatment Means" appropriate? ​

A) When the number of sample differences is at least 30.
B) When the sample sizes are at least 30.
C) When the treatment response distributions are approximately normal.
D) When individuals or objects are randomly assigned to treatments (or vice versa) .
E) None of above.