Solution
even if - Wrong
Like saying "I eat ice cream even if I play outside" - doesn't make sense here because talking and delivering milk aren't opposing actions.
in addition - Wrong
Like saying "I went to school. In addition, I wore my uniform." These are not separate activities to add together.
rightly - Wrong
This isn't a joining word at all. It's like trying to say "I play games rightly I do homework" - makes no sense!
while - Right
Like saying "I sing while I take a shower" - shows two things happening at the same time. The milkman talks to people while he gives them their milk, just like you might hum while brushing your teeth.
Related questions:
IPMAT Rohtak 2019
IPMAT Rohtak 2020
IPMAT Rohtak 2019
IPMAT Rohtak 2019
IPMAT Rohtak 2020