Which change will cause an infinite flow?

$\backslash$table$[[$Box NO$.$:$,1,2,3,4,5,6,7,8,9,10],[,3,9,1,0,10,8,5,2,,]]$

A: Subtract the number in Box $2$ from number in Box $8.$ Put the result in Box $6.$

B: Add the number in Box $4$ to number in Box $5.$ P$$t the result in Box $1.$

C: Is number in Box $6>$ number in Box $1?$

D: Subtract the number in Box $1$ from number in Box $7.$ Put the result in Box $3.$

E: Subtract the number in Box $10$ from number in Box $9.$ Put the result in Box $1.$

F: Is number in Box $3$ number in Box $6?$