Directions: For the following question, choose the option that fills up the blank most correctly.

Men imagine that they communicate their virtue or vice only by _________ actions, and donot see that virtue or vice emit a breath every moment.

The second part of the sentence 'and don't moment' is contrary to the first part as indicated by the 'don't'. 'Emit a breath' implies that men do good deeds from within, it also requires your inner force as this force is hidden, they don't seem to realize it. Therefore, the opposite of hidden, not apparent characterize the blank. 'Overt' is not hidden, open or apparent. Hence, (4) is the answer.