The command in Option D correctly uses a loop to iterate over the range {1...5}, which represents the first five interfaces. The dohost command is used to send commands to the host Cisco Nexus switch from the Guest Shell. The syntax interface eth1/$x and description Server$x within the loop sets the description for each interface eth1/1 to eth1/5 to "Server1" to "Server5" respectively.
Here's the command from Option D formatted for clarity:
[guestshell@guestshell ~]$ for x in {1..5}; do
dohost "conf t" ;
interface eth1/$x;
description Server$x;
done
This command will configure the description for each of the first five Ethernet interfaces with the respective server number as part of the description.