Correct answer is (a) True
The best I can explain: The weight of total voids Wv is equal to the sum of weights of Water Ww and air Wa. Wv=Ww+Wa. Here, the weight of air is considered to be negligible. ∴ Wa=0
Therefore, Wv=Ww , i.e., weight of total voids is equal to the weight of Water.