Only one can is enough for making sandwiches.
Answer: Option D.
Step-by-step explanation:
A can does not have in it one tuna fish in it. It has more than one in it. So not more than one can should be required to make sandwiches for the members of the family who are not more than four. One can is enough for making sandwiches for the whole family.
A member can have one sandwich only so not more than one can should be required to make the sandwiches for the whole family including sandwiches for himself.