A good businessman should not be unscrupulous while making profits The underlined word means:

Explanation

The word unscrupulous refers to a lack of moral principles or being unethical, as highlighted in Option A, which is unprincipled. The other options are incorrect because: 'careless' refers to negligence rather than ethics; 'illegal' relates to breaking laws, not necessarily lacking principles; and 'miserly' describes someone who is stingy, not someone who is unprincipled.