The correct answer is A.
Objective means not influenced by personal feelings or opinions in considering and representing facts.
The word cleverly itself is objective as it points to the fact that something was done in a right manner. Cleverness is associated with being right or doing good, so its meaning is positive. The listeners, hearing the word cleverly, would automatically assume that the goal of the sentence was achieved, without being given any farther reason for it.
By removing the word cleverly, the sentence becomes objective, as the readers form their own conclusions about its meaning, without being influenced by a word associated with positiveness.