Low Consumer involvement in purchase and little significant brand difference comes in which types of buying behaviors.?

My answer would be Habitual Buying Behavior.  It is also called the Routine Response Buying Behavior or Programmed Buying Behavior as in this type of buying behavior there is very low involvement of the customer.  Normally these are frequently purchased, low cost items and customer has to put a very little effort to search it.  Brand differentiation is also very little in such type of buying behavior.   But this does not mean that one product always comes under the same category of buying behavior, it may change from category to the other depending upon the type of customer.

No.3- Habitual buying behavior