This is because EIGRP is an advanced distance vector routing protocol that uses a composite metric to calculate the best path to a destination. EIGRP has a default administrative distance value of 90, which means that it is more trustworthy than RIP (120) or OSPF (110), but less trustworthy than BGP (20). The source of this answer is the Cisco ENCOR v1.1 course, module 4, lesson 4.1: Implementing EIGRP.