Refer to the exhibit. B receives a packet with a destination address of 10.16.1.97. What will router B do?

Router B will use its default route when no more specific route matches the destination. The packet's destination address 10.16.1.97 does not match any specific route in the routing table (likely only has the route to 10.16.1.64/26 and a default route). With ip classless behavior, the router uses the default route rather than dropping the packet.