Concept: The key is to arrange the sentences so that they form a logical and coherent paragraph. The first (S1) describes spring arriving everywhere. The last (S2) shows the Snow and Frost claiming the garden. The middle sentences must connect these ideas smoothly.
Explanation: S1 tells us spring has come to the whole country. Sentence B follows logically: it says that only the Selfish Giant's garden still has winter. Next, sentence C explains why the garden is still winter — because there are no children, so birds don’t sing and trees don’t blossom. Sentence D adds a specific detail: a flower sees the notice-board, feels sorry for the children, and goes back to sleep. Finally, sentence A ties in with S2: the Snow and Frost are pleased with the constant winter. Thus, the correct order after S1 is B, C, D, A.
Answer: The correct sequence is BCDA, which corresponds to option 2.