Viscosity is the property of the liquid by virtue of which it opposes the relative motion between its adjacent layers.

(A) The viscosity of an ideal fluid is zero.

(B) With the rise in temperature, the viscosity of liquids increase and that of gases decrease.

(C) The viscosity of gases is much less than that of liquids.

(D) Viscosity of liquid generally increase with increase in pressure.

Choose the correct answer from the options given below:

Option 1 -> Includes statement (B) which incorrectly states temperature effects on viscosity.

Option 2 -> Includes statement (B) which incorrectly reverses the temperature-viscosity relationship for liquids and gases.

Option 3 -> Contains statements (A), (C), and (D): ideal fluid has zero viscosity ✓, gases have lower viscosity than liquids ✓, and liquid viscosity increases with pressure ✓.

Option 4 -> Excludes statement (A) and includes incorrect statement (B).

Hence, Option 3: (A), (C) and (D) only -> Statement (B) is incorrect because with rise in temperature, viscosity of liquids DECREASES (increased molecular motion overcomes intermolecular forces) while viscosity of gases INCREASES (enhanced momentum transfer between molecules). Statements (A), (C), and (D) are all correct principles of viscosity -> correct