In-situ field unit weight / density of soil is determined using Core-cutter method (C), Sand replacement method (D), and Water replacement method (E) (used for coarse gravelly soils). Pycnometer (A) determines specific gravity/water content in lab, and Oven dry method (B) determines moisture content. Option analysis: (A) Includes lab water content/SG methods. (B) Oven dry determines water content, not unit weight. (C) (C), (D) and (E) only are the standard field unit weight determination methods. (D) Includes pycnometer.

Statement (I) is true: fine-grained clays possess flocs and microscopic pore structures yielding void ratios often exceeding $0.8$ to $\gt 2.0$, whereas coarse sand/gravel has dense packing with void ratio typically $0.3$ to $0.7$. Statement (II) is false: when soil is fully saturated, the degree of saturation $S = 1$ ($100\%$); the void ratio $e = V_v/V_s$ can be any positive value, independent of saturation. Option analysis: (A) Statement (II) is false. (B) Statement (I) is true. (C) Statement (I) is true but Statement (II) is false is the correct answer. (D) Inverted.