Three words in bold are given, which have something in common among themselves. Out of the four given alternatives, choose the most appropriate description of these three words: knight, rook and bishop.

Introduction / Context:
This question is about recognising the common context of three names: knight, rook and bishop. Each of these words can have multiple meanings in English, including historical, religious and strategic uses. The challenge is to decide which description captures their most important shared identity in a typical reasoning question, which usually comes from a familiar game or structured activity.

Given Data / Assumptions:

• The words under consideration are knight, rook and bishop.
• We assume well known dictionary meanings rather than rare or highly specialised uses.
• Each word appears as the name of a piece in a popular board game.
• We must choose the option that correctly describes all three words together.
• The correct answer should match the everyday exam context, which often includes chess.

Concept / Approach:
Knight, rook and bishop are all names of pieces in the game of chess. While knight and bishop also occur as social or religious titles in history, and rook may suggest a bird or a tower, the joint appearance of all three together strongly signals the chess meaning. Reasoning questions frequently expect recognition of this link, since chess is a standard reference for logic and strategy.

Step-by-Step Solution:
Step 1: Consider the word knight. In chess, the knight is the piece that moves in an L shape and can jump over other pieces. Step 2: Consider the word rook. In chess, the rook is the piece that moves any number of squares horizontally or vertically along ranks and files and is sometimes called the castle. Step 3: Consider the word bishop. In chess, the bishop moves diagonally across the board and represents a religious figure in the design of traditional sets. Step 4: Note that all three words appear together on the chessboard as specific, named pieces with defined moves. Step 5: Look at the options and identify which one describes this shared identity. The option saying that these are chess pieces fits all three clearly. Step 6: Confirm that no other option simultaneously applies to knight, rook and bishop in the same strong way.

Verification / Alternative check:
It is true that knight can be a medieval warrior and bishop is a senior church official. However, rook is not used as a title for a religious person or a missionary. Moreover, all three names appear together only in the context of chess rules and strategy diagrams. This makes the chess interpretation uniquely suitable. Reasoning questions tend to rely on such well known game terminology because it is widely recognised by students and adults alike.

Why Other Options Are Wrong:
Calling them missionaries is incorrect because rook has no such meaning, and knight is primarily a warrior rather than a missionary. Describing them as churchmen fits bishop but not knight or rook. Referring to them as military ranks is only loosely appropriate for knight, and again does not cover rook or bishop accurately.

Common Pitfalls:
Some candidates are misled by the religious meaning of bishop and overlook the chess context. Others may not be familiar with the name rook and therefore guess based on knight alone. The safest strategy is to think of contexts where all three names appear together in a single system or rule set. Chess is the only strong and widely known system that uses all three terms as official piece names, which makes the correct answer clear once that connection is recognised.

Final Answer:
Knight, rook and bishop are all chess pieces.