option (D)
Router has 3 kinds of information in routing table
1-Network IP address
2-Subnet mask
3-interface id
as given in the ques 3 IP addresses so router will contain 3 entries for these 3 IP address matching with corresponding interface and it will also have a default entry (0.0.0.0). When it will not match with the given IP addresses ,in that case it will go through the default entry .Hence total number of entries =4