In the Following Excerpt from a Proposal Seeking Funding to Upgrade

In the following excerpt from a proposal seeking funding to upgrade a police department's crime lab, which of the techniques listed below for making a persuasive case does the writer use? In the past four years, the department's crime lab has experienced an increase in fingerprint evidence for comparisons. The increase in volume is a result of submissions from other rural agencies in the state. However, because our agency cannot access data maintained within the state's Automated Fingerprint Identification System (AFIS) , submissions are limited to manual searches of the files maintained by our department. You can imagine the likelihood of missing a fingerprint match while looking through thousands of fingerprints by hand. In fact, Harlan Andrews, a Senior Investigator at the Federal Bureau of Investigation's laboratory, reports that manual searches often fail to find matches when in fact fingerprint matches exist. To prevent such errors, our department needs to upgrade its computer system to allow access to AFIS.

A) visual evidence
B) examples
C) expert testimony
D) numerical data