We are given a scenario about a country named ``Elvesland" where emotions are declared through the gifting of flowers. The statements provided are:
- (i) In Elvesland, one always declares one's love by gifting a white flower.
This statement cannot be inferred with certainty because although gifting a white flower represents love, it is not stated that it is the only way to declare love. There might be other ways. Therefore, (i) is not necessarily true.
- (ii) In Elvesland, all emotions are declared by gifting flowers.
We cannot infer this because it was mentioned that some emotions (like love and anger) are represented by gifting flowers, but we don't have information to confirm that all emotions are declared this way. Therefore, (ii) is not necessarily true.
- (iii) In Elvesland, sometimes one expresses one's anger by gifting a flower that is not yellow.
We are told that gifting a yellow flower symbolizes anger, but there is no indication that a flower of another color could represent anger. This statement (iii) cannot be confirmed. Therefore, (iii) is not true.
- (iv) In Elvesland, sometimes one expresses one's love by gifting a white flower.
This statement is clearly true as it is explicitly mentioned in the scenario that gifting a white flower is a declaration of love.
Thus, the only statement that can be logically inferred with certainty is (iv). Therefore, the correct answer is (D).