Common Output Question in AMCAT 6 | Find output

Q.

function Display(string my str)//statement 1
{
print "hello my name is"
print mystr //statement 2
}
function main() //statement 3
{
string str = "mr.beans"
integer num = display(str) // statement 4
}
option:
a)statement 1 error
b)statement 2 error
c)statement 3 error
d)statement 4 error

Answer: d)