Correct Answer: Credulous

Solution : The correct choice is the second option .

The word that can substitute the given group of words is credulous , which describes a person who is too willing to believe or trust something without sufficient evidence or proof.

The meanings of the other options are as follows:

• Cosmopolitan : This refers to someone familiar with and at ease in many different countries and cultures.
• Streetwise : It refers to someone who has a practical understanding of how things work in urban environments, particularly involving street-smart knowledge.
• Wary : This describes a person who is cautious, watchful, or alert, especially in the face of possible danger or deception.