The answer is B. Morals.
While feelings and ideas are aspects of human behavior that can also be described as <em>intelligent communications</em> for their content and their ability to convey information to others, morals are the only capable of imprinting a sense of liability in our actions, giving us a sense of duty towards keeping what we think, what we feel and what we do honest to our moral standards.
Mary will be 18 when she is twice as old as her brother
D) Nitrogen-fixing bacteria in root nodules of legumes.
