If someone is described as ingenuous, they are likely:

If someone is described as ingenuous, they are likely to be simple and unaffected. The term "ingenuous" refers to a person who is innocent, naive, and candid, often displaying a lack of pretense or sophistication. This quality signifies an honesty and openness that can sometimes come across as a childlike simplicity or straightforwardness in their interactions with others.

The other options relate to characteristics or traits that suggest complexity, deception, or sophistication, which are contrary to what being ingenuous implies. A person who is wise beyond their years or worldly and sophisticated would typically have an understanding or experience that contrasts with the straightforward and uncomplicated nature described by ingenuous. Similarly, being highly skilled in deception is directly opposite to the authenticity that comes with being ingenuous. Thus, the choice indicating simplicity and lack of sophistication aligns perfectly with the definition of the term.