The results of a consolidation test on an undisturbed soil, sampled at a depth of $10 \: m$ below the ground level are as follows:
$\begin{array}{lcl} \text{Saturated unit weight} & : & 16 \: kN/m^3 \\ \text{Pre-consolidation pressure} & : & 90 \: kPa \end{array}$
The water table was encountered at the ground level. Assuming the unit weight of water as $10 \: kN/m^3$, the over-consolidation ratio of the soil is
- $0.67$
- $1.50$
- $1.77$
- $2.00$