Match List I with List II.

List I	List II
(a) Isothermal	(i) Pressure constant
(b) Isochoric	(ii) Temperature constant
(c) Adiabatic	(iii) Volume constant
(d) Isobaric	(iv) Heat content is constant

Choose the correct answer from the options given below:

We need to match each thermodynamic process with the quantity that remains constant.

(a) Isothermal process: The prefix "iso" means equal and "thermal" refers to temperature. So in an isothermal process, temperature is constant. This matches with (ii).

(b) Isochoric process: "Choric" comes from the Greek word for volume. So in an isochoric process, volume is constant. This matches with (iii).

(c) Adiabatic process: In an adiabatic process, no heat is exchanged with the surroundings. So the heat content is constant ($$\Delta Q = 0$$). This matches with (iv).

(d) Isobaric process: "Baric" refers to pressure. So in an isobaric process, pressure is constant. This matches with (i).

The correct matching is (a)→(ii), (b)→(iii), (c)→(iv), (d)→(i).

Hence, the correct answer is Option A.