Here, $\implies$ means print.
fun1(0) $\implies$ {nothing}
fun2(0) $\implies$ {nothing}
fun1(2) $\implies$ 2 {fun2(0)} 2 $\implies$ $22$
fun2(1) $\implies$ 1 {fun1(2)} 2 $\implies$ $1222$
fun1(3) $\implies$ 3 {fun2(1)} 3 $\implies$ $312223$
fun2(2) $\implies$ 2 {fun1(3)} 3 $\implies$ $23122233$
fun1(4) $\implies$ 4 {fun2(2)} 4 $\implies$ $4231222334$
fun2(3) $\implies$ 3 {fun1(4)} 4 $\implies$ $342312223344$
fun1(5) $\implies$ 5 {fun2(3)} 5 $\implies$ $53423122233445$
Answer :- A.