A should be the correct answer, prefered IP will be used as source for outgoing packets.
Primary defined IP's will be used just for broadcast and multicast
https://www.youtube.com/watch?v=045KRRS9fCg&t=396s
this question does not make sense. All four IP addresses configured all belong to different subnets. Hence there is only one "preferred" IP address per subnet. So it depends which subnet the destination IP is part of, but the question does not say.
based on https://www.juniper.net/documentation/en_US/junos9.5/information-products/topic-collections/config-guide-network-interfaces/interfaces-configuring-default-primary-and-preferred-addresses-and-interfaces.html
The primary address on an interface is the address that is used by default as the local address for broadcast and multicast packets sourced locally and sent out the interface
and lower IP is B.
Preferred used - ANSWER C - Lowest IP -JunOS Explenation:
Configure the Preferred Address for an Interface
The preferred address on an interface is the default local address used for packets sourced by the local router to destinations on the subnet. By default, the numerically lowest local address is chosen. For example, if the addresses 172.16.1.1/12, 172.16.1.2/12, and 172.16.1.3/12 are configured on the same interface, the preferred address on the subnet (by default, 172.16.1.1) is used as a local address when you issue a ping 172.16.1.5 command.
ASWER C - Lowest IP
You forgot to copy last part of that:
To set a different preferred address for the subnet, include the preferred statement:
This means if you set "preferred" it will take even interfaces has lower ip
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