How would you modify the following expression to print each word on a separate line?

print$("$hello world"$)$

a$.)$

print$("$helloworld

$")$

b$.)$

print$("$hello

world"$)$

c$.)$

print$(\text{'}$hello$\text{'}+$'world'$)$

d$.)$

print$(\text{'}$hello$/$nworld$\text{'})$