Answer:
c. Kudos to all you green-minded staff members for making HealthyFoods a pioneer in sustainable business practices!
Step-by-step explanation:
This subject line is catchy because it starts out informal and sounds fun with Kudos.
It goes on to use use more informal words like 'green-minded staff' to refer to people that are conscious of positive impact of environmental protection.
Finally it takes about HealthyFoods and how it has become a pioneer in sustainable business practices.
Basically it takes the ideas of the two other headings and combines them in a fun way.