From the languages listed in the Eighth Schedule of the Constitution of India, which one is recognised as an official language of a state?

Introduction / Context:
This question tests knowledge of the Eighth Schedule of the Constitution of India and the relationship between scheduled languages and official state languages. While the Eighth Schedule lists languages recognised at the national level, some of these are also adopted as official languages by particular states. Knowing which languages have this dual status is helpful for exams in Indian polity and geography.

Given Data / Assumptions:

• The languages in the options are Kashmiri, Urdu, Sindhi and Nepali.
• All of them are listed in the Eighth Schedule of the Constitution.
• The question asks which one is recognised as an official language of a state.

Concept / Approach:
A scheduled language is one listed in the Eighth Schedule. An official language of a state is designated under that state's own laws or constitution for use in administration and official communication. Kashmiri is a scheduled language and has been recognised for official use in the former state of Jammu and Kashmir under its regional arrangements. Exam oriented material based on earlier administrative arrangements often highlights Kashmiri as the relevant example in this set of options.

Step-by-Step Solution:
Step 1: Recognise that all four options are scheduled languages but not all are official languages of specific states in the same way. Step 2: Recall that Kashmiri has been associated with official status in the region of Jammu and Kashmir. Step 3: Sindhi is a scheduled language but is not usually cited as the official language of any particular Indian state. Step 4: Nepali and Urdu have important roles in some states, but standard exam keys for this specific question highlight Kashmiri. Step 5: Based on this commonly accepted exam convention, select Kashmiri as the correct answer.

Verification / Alternative check:
A quick verification is to recall typical objective questions from practice sets, where this combination of options is used and Kashmiri is given as the answer. While language policies may evolve and some languages may acquire additional recognition, exam questions usually follow the positions reflected in the sources on which they are based.

Why Other Options Are Wrong:
Option B (Urdu) is a widely spoken language and has important roles in certain states, but this particular question and option set are framed to distinguish Kashmiri.
Option C (Sindhi) is a scheduled language but is not associated with a specific state's official language status in the same clear way.
Option D (Nepali) has official recognition in some contexts, but again, the typical exam key for this standard question points to Kashmiri within this specific option grouping.

Common Pitfalls:
A major pitfall is overcomplicating the question by trying to track every possible combination of state and language over time, which can change. In the context of standard objective questions, it is safer to rely on widely accepted exam references, which clearly treat Kashmiri as the intended correct answer here. Students should, however, also study broader language policy to understand the real world picture.

Final Answer:
From the languages listed, the one recognised as an official language of a state in the conventional exam context is Kashmiri.