Hi There,
OK so this choose method takes a list rather than named arguments. Please can you check what happens if you use
theseRows = choose([1, 2, 3])
console.log('the selected item was', theseRows)
Then when you are online, try opening the developer tools (see crib sheet if unsure there PsychoPy Python to Javascript crib sheet) to see if you get the expected printout and check your choose function is working.
Becca