Select the incorrectly spelt word from the given sentence.
The most notorious serial killer of the 19th century remains known only by the psudonym of Jack the Ripper.

Correct option is C

The incorrectly spelt word is psudonym, which should be pseudonym.
Correct spelling: "Pseudonym" means a fictitious name used by an author or person. Example: The author used a pseudonym to remain anonymous.
Meanings of the other options:
· Century: (सदी) Refers to a period of 100 years. Example: The 21st century has seen rapid technological advancement.
· Notorious: (कुख्यात) Refers to someone or something infamous or well-known for a bad reason. Example: He is notorious for breaking the rules.
· Serial: (क्रमिक) Refers to something that occurs in a series. Example: She is a fan of the latest crime serial.