Answer: Fraudulent is to deceitful as fastidious is to D. Particular.
Explanation: "Fraudulent" and "deceitful" are words that have similar meanings. "Fraudulent" is used to describe someone that tends to cheat and to be dishonest, and "deceitful" portrays someone as intended to deceive. On the other hand, "Fastidious" is similar in meaning to the word "particular" since "fastidious" is used to describe a person as someone who pays great attention to details and "particular" is also used to refer to someone as concerned about details and accuracy.