Matlab Deciding Output based on matrix condition

so i have this matrix

A=
7

B=
0.34   0.34   0.34
0.50   0.25   0.25

and this matrix

C=
1
1
4
2
3
6
3

with this rule:

• if t=1 then the output = mp*(fp first row)
• if t=2 then the output = mp*(fp 2nd row)

if t not 1 or 2 then output = t

so the output should be like this:

output=
7.14
7.14
4
7
3
6
3

im trying using this code but its doesnt work

sizeA=size(A,1)
sizeB=size(B,1)
for i=1:sizeB
    if (B(i)<=sizeA)
        Output=sum(repmat(A,1,length(C))'.*B(C,:),2)
    else 
        Output=C(i)
    end
end