The best reason to conduct a social engineering test in a call center is to identify candidates for additional security training because it helps to assess the level of awareness and skills of the call center staff in recognizing and resisting social engineering attacks, and provide them with the necessary training or education to improve their security posture. Minimizing the likelihood of successful attacks is not a reason to conduct a social engineering test, but rather a possible outcome or benefit of conducting such a test. Gaining funding for information security initiatives is not a reason to conduct a social engineering test, but rather a possible outcome or benefit of conducting such a test. Improving password policy is not a reason to conduct a social engineering test, but rather a possible outcome or benefit of conducting such a test. References:
https://www.isaca.org/resources/isaca-journal/issues/2017/volume-6/the-value-of-penetration-testing
https://www.isaca.org/resources/isaca-journal/issues/2016/volume-5/security-scanning-versus-penetration- testing