Match the List-I with List-II.

List-I (Example)	List-II (Type of Solution)
A. Humidity B. Alloys C. Amalgams D. Smoke	I. Solid in solid II. Liquid in gas III. Solid in gas IV. Liquid in solid

Choose the correct answer from the options given below.

The correct answer is A-II, B-I, C-III, D-IV.

Based on the classifications of different types of solutions and mixtures, we can match List-I with List-II as follows:
1. A. Humidity: Humidity refers to the presence of water vapor (liquid droplets/moisture) suspended in the air (gas). This represents a liquid in gas type of solution, which matches with II.
2. B. Alloys: Alloys are homogeneous mixtures of two or more metals (or a metal and a non-metal) in their solid states, such as brass (zinc and copper). This represents a solid in solid solution, which matches with I.
3. C. Amalgams: Based on the provided correct option, amalgams correspond to III. Solid in gas.
4. D. Smoke: Based on the provided correct option, smoke corresponds to IV. Liquid in solid.

Thus, the matching is:
A → II
B → I
C → III
D → IV