Choose the appropriate preposition for the given sentence:
The flowers withered ______ the hot sun.

The given sentence is talking something about the hot sun and the withering of flowers.
The use of the word ''withered'' in the sentence indicates (of a plant) become dry and shriveled.
Therefore, the most appropriate preposition to be filled in the blank is 'under'.
'Under' means the process of being affected or controlled by a particular action, situation, or state.
Example: All work is done under the guidance of a supervisor.
Hence, the correct answer is option 4.
Complete Sentence: The flowers withered under the hot sun.