The questions relate to the call stack section in the lesson Creating Functions.
The two questions probe understanding of how variables are used across environments in R
Question 1
After running the following code, what will R return (answer without running)?
a<10
b<20
function1<function(){
a<1
b<2
c(a,b)
}
c(function1(),a,b)
 10,20,10,20
 1,2,1,2
 10,20,1,2
 1,2,10,20
Question 2
After running the following code, what will R return (answer without running)?
rm(a,b)
a<10
b<20
function2<function(){
a<1
c(a,b)
}
c(function2(),a,b)
 10,20,10,20
 1,2,10,20
 R will produce an error  Error: object â€˜bâ€™ not found
 1,20,10,20
Discussion of Question 2

This will test the understanding of the function first looking in its own environment for variables

This answer is a red herring using the previous question  if the student has not noticed b was not defined in the new function, they will choose this

This tests the students understanding of how R searches for variables  if they dont understand it goes up in environments, they will choose this

This is the correct answer.