The pattern in this set is based on the distinction between processes (actions) and the result (a concept).

• Write: This is a verb, an action or process used to record or express information.
• Read: This is a verb, an action or process used to acquire information.
• Learn: This is a verb, the overall process of acquiring knowledge or skill.
• Knowledge: (The Odd One Out) This is a noun. It is the outcome or result obtained through the processes of reading, writing, and learning. It is a concept, not an action itself.

Conclusion: "Knowledge" is the odd one out because it is a noun representing a concept, while the other three words are verbs representing the actions or processes used to attain that concept.

Final Answer: The correct option is B. Knowledge.