This question is asking you to match the different climate types according to Koeppen`s classification with their corresponding letter codes.

In Koeppen`s Climatic type classification, the different climate types are represented by a letter code. Here are the options provided and their respective codes:

Option 1: Tropical wet - Letter Code: Af

Option 2: Mid-latitude desert - Letter Code: Cs

Option 3: Mediterranean - Letter Code: Df

Option 4: Humid continental - Letter Code: BWk

To find the correct answer, you need to match each climate type with its corresponding letter code.

According to the given options, the correct answer would be 1. Tropical wet - Letter Code: Af.

Therefore, option 1 matches with letter code 1.

Remember, the code given below the Lists is used to select the correct answer. In this case, the code is 1423, so you need to match each option with the corresponding digit in the code to find the correct answer.

In summary, option 1 (Tropical wet) matches with letter code 1 (Af), and that is the correct answer for this question.