The yarn, twine, and cord are all used for tying. The tape is not used in the same way.

A leopard, cougar, and lion all belong to the cat family; an elephant does not.

The couch, table, and chair are pieces of furniture; the rug is not.

The cornea, retina, and pupil are all parts of the eye.

The noun, preposition, and adverb are classes of words that make up a sentence. Punctuation belongs in a sentence, but punctuation is not a class of word.

An index, glossary, and chapter are all parts of a book. Choice a does not belong because the book is the whole, not a part.

The first three choices are all synonyms.

The wing, fin, and rudder are all parts of an airplane.

The core, seeds, and pulp are all parts of an apple. A slice would be a piece taken out of an apple.

A peninsula, island, and cape are all landforms; a bay is a body of water.