Final answer:
The correct preposition to use when referring to statistics from the CDC is 'in'.
Step-by-step explanation:
The correct preposition to use in this context is b) in.
When referring to a source, such as the statistics from the CDC, we use the preposition 'in' to indicate the location or source of the information. For example, we can say 'Check out the statistics from the CDC in their latest report.' Therefore, the correct answer is b) in.
The correct preposition to use when referring to information found on the Centers for Disease Control and Prevention's (CDC) website is 'on.' Therefore, the sentence should read, "Check out statistics on the CDC slides".