Answer:
Option A,B,D
Explanation:

F= Upthrust= VdFg
Equilibrium of A
VdFg=T+WA
=T+VdAg
Equilibrium of B
T+VdFg=VdBg
Adding Eqs. (i) and (ii), we get
2dF=dA+dB
∴ Option(d) is correct
From Eq. (i), we can see that
dF>dA [as T >0]
∴ Option (a) is correct
From Eq. (ii) we can see that
dB>dF
∴ Option (a) is correct.
∴ Correct options are (a), (b) and (d)