Which one of the following elements is involved in the control of water content of the blood?

Directions :
The question item consists of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below.
Statement I :
By far the most common topographic form in a Karst terrain is the sinkhole.
Statement II :
Topographically, a sinkhole is a depression that varies in depth from less than a meter to a few hundred meters.

Consider the following chemical reaction :

${\mathrm{aFe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right) + \mathrm{bCO}\left(\mathrm{g}\right)\to \mathrm{cFe}\left(\mathrm{s}\right)+{\mathrm{dCO}}_2$

In the balanced chemical equation of the above, which of the following will be the values of the coefficients a, b, c and d respectively?

Consider the following statements :

1. There is no net moment on a body which is in equilibrium.
2. The momentum of a body is always conserved.
3. The kinetic energy of an object is always conserved.

Which of the statements given above is/are correct?