$A$ hydrophilic surface is characterised by the contact angle at the water-solid interface. The value of the contact angle should be:

$A$ liquid wets a solid completely. The meniscus of the liquid in a sufficiently long tube is

The liquid meniscus in a capillary tube will be convex,if the angle of contact is

By adding soluble impurity in a liquid,the angle of contact

Given below are two statements: One is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Clothes containing oil or grease stains cannot be cleaned by water wash.
Reason $(R)$: Because the angle of contact between the oil/grease and water is obtuse.
In the light of the above statements,choose the correct answer from the options given below.

What is the nature of the meniscus for a liquid with an angle of contact of $0^{\circ}$?