A

Step 1: Let's analyze the physical quantities in Column I and match them with the appropriate units in Column II.

(a) Coefficient of linear expansion: This is a measure of the fractional change in length per degree change in temperature. The unit is typically expressed as Cal/°C, making (a) matches with (p).

(b) Water equivalent: This is the mass of water that absorbs the same amount of heat as a given mass of a substance for the same temperature rise. The correct unit for this is gm, so (b) matches with (q).

(c) Heat capacity: This is the amount of heat required to change the temperature of a body by one degree Celsius, and its unit can be expressed in terms of Cal/°C (but we notice this is already taken), thus we use the other form which corresponds to its derivative unit (°C)^–1. So (c) matches with (r).

(d) Specific heat: This is the amount of heat required to raise the temperature of 1 gram of a substance by 1°C, and its unit is Cal/g°C. Thus (d) matches with (s).

Based on the analysis, the matching pairs are:

• (a) with (p)
• (b) with (q)
• (c) with (r)
• (d) with (s)

Therefore, option A is correct.