Final answer:
option b,The method used to change a group's title is typically 'set_title'. By calling this method on a group object and passing a new title as an argument, the group's title can be updated accordingly.
Step-by-step explanation:
To make changes to the group's title, the method commonly used in programming and application development is set_title. When dealing with an object or a module that represents a group, calling the set_title method would allow you to update the group's title to a new value. The method typically requires you to pass a new title string as an argument.
For example, if you are working with a chat application and you have an object that represents a user group, you might use the following code to change the group's title:
group.set_title('New Group Title')
This code calls the set_title method on the object group and updates its title to 'New Group Title'. It is important to note that the syntax and the exact method name can vary depending on the programming language and the software framework you are using.