Select the sentence with an appositive phrase and a relative pronoun. A tiny cat named Tiny sits all day in the window and watches people pass by.
The cat, which is a Calico, sits in the window all day.
Tiny, a Calico cat, is a close watcher of all who pass by.
Tiny, a fierce people-watcher, is her cat that is new.

The cat, which is a calico cat, sits in the window all day.

Explanation:

" calico cat " is your appositive

" which " is your relative pronoun

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).