Which of the following qualifications enables a person to train pesticide handler employees in commercial or research production of an agricultural plant commodity?

A professor at the University of California possesses the appropriate educational background and expertise needed to train pesticide handler employees, particularly in the context of commercial or research production of agricultural plant commodities. This position typically implies an advanced understanding of agricultural sciences, pest management, and the regulations surrounding pesticide use. Professors in such a role are likely to have comprehensive knowledge of safe handling practices, pesticide application techniques, and the legal requirements for pesticide use, making them well-equipped to provide thorough training and ensure compliance with regulatory standards.

Additionally, their role often includes teaching and disseminating research-based information, further supporting their capability to educate others effectively in this specialized field. Hence, it is reasonable to conclude that a professor would have the necessary qualifications to handle this training responsibility effectively.