Python: What is wrong with the following code snippet that is supposed to print the contents of the file twice?

infile $=$ open$("$input$.$txt$","$r$")$

for sentence in infile :

print$($sentence$)$

for sentence in infile :

print$($sentence$)$

The program cannot use the variable sentence twice

A run$-$time error occurs because the file does not exist

Python cannot iterate over the file twice without closing and reopening the file

Nothing, the code prints the contents two times