slight smile comes on her face by seeing the person whom she likes
Jean Crevecoeur wrote an essay titled "What is an American". The purpose of this essay is to introduce America as a new land to the Europeans who know nothing about America. He describes the differences between America and Europe, the opportunities for employment, the people's freedom and their ability to have a relationship with nature. The reoccurring theme throughout this essay is how good the new land is compared to Europe. He states that it is easier to live in America than under the strict and unfair regimes in Europe
The phrase from the excerpt that suggests that Krogstad is prone to engage in crime and may, in fact, be a criminal is the following one:
diseased moral character
It is the only option that talks about somebody being a bad person, which is what Krogstad is. The other options do not show that moral ambiguity this option does.