base running appeals

[ump50]

I get confused on who can score on a appeal
Question one R1 is on third,R2on second and R3 on first with two outs.B6's
doulbe sends all runners home.B6 is thrown out at third and the defense legally and properly appeals R3 misses second base.How many runs score
A.0 B.1 C.2 D.3 I believe the answer would be C.2 because they score before
R3 misses the base

Question two DH At the start of the game,Jones is the Dh,batting for Harris,the second baseman.In the third inning Harris bats for himself.In the fifth inning the coach wants Jones to re-enter and bat for Harris U1 will
A.not allow the substitution.The role of the DH ended when Harris batted for himself
B. allow the substitution,but Harris is out of game
C. Not allow the substitution.Jones can re-enter the game later but not in Harris batting position
D.Allow the substitution.Harris can re-enter the game later as long as he occupies his original batting position
I believe the answer is B