The minimum amount of water required to be added to the soil, expressed as percentage of weight of the soil, that will just make it flow like a liquid when jarred slightly is known as __________.

Correct option is A

Liquid limit (WL):
It is defined as the minimum water content at which the soil is still in the liquid state, but has a small shearing strength against flowing, which can be measured by available means.
Plastic limit (Wp):
Defined as the minimum water content at which the soil starts to crumble when rolled into a thread of approximately 3 mm diameter.
Shrinkage limit (Ws):
Defined the maximum water content at which, the reduction in water content will not reduce the volume of the soil mass.
Also, it is the lowest water content at which the soil can still be completely saturated