Answer:
C. A veterinary technicians' job board.
Step-by-step explanation:
Dan's desire to work with animals will ensure that the field of work will be that of a veterinarian line. Also, using a resource created by several professionals from that field suggests the resource is not a school's webpage or social media profile.
Considering Dan found the site about "available jobs" created by "several animal healthcare professionals", we can safely assume that the resource is a veterinary technician's job board. This site will contain or list all the jobs available, giving Dan access to the available jobs.
Thus, the correct answer is option C.