Four words are given; choose the one which is incorrectly spelt: Accurate, Business, Sedentery, Jewellery.

Introduction / Context:
Spelling questions test your familiarity with standard English spellings, especially for commonly used words where silent letters or unusual endings often cause confusion. In this item, you are given four everyday words and must identify the one that is not spelt according to standard English usage. Such questions are frequent in competitive exams because they quickly reveal whether a candidate reads widely and pays attention to details.

Given Data / Assumptions:
- The four options are "Accurate", "Business", "Sedentery", and "Jewellery".
- Only one of these is incorrectly spelt.
- The correct forms of these words are established in standard dictionaries of English.
- You must know or recall the standard spelling rather than rely only on how familiar a word looks at first sight.

Concept / Approach:
The correct spellings are: "accurate" for something correct and precise, "business" for commercial activity or work, "sedentary" for a lifestyle involving much sitting and little physical activity, and "jewellery" for ornaments made of precious metals and stones (British spelling). In the options, "Sedentery" has been deliberately misspelt with the ending "ery" instead of "ary". Recognising patterns like "-ary" in adjectives helps you catch such errors quickly in the examination.

Step-by-Step Solution:
Step 1: Check "Accurate". This is a common word meaning correct or exact; the spelling with "ccu" and "ate" is standard. Step 2: Check "Business". It is correctly spelt with "busi" followed by "ness". There is no extra "z" or odd vowel. Step 3: Check "Sedentery". You might recall the adjective "sedentary". The final sound is "tary", not "tery". Step 4: Check "Jewellery". In British English, "jewellery" with double "l" is correct. In American English, "jewelry" is also accepted, but "Jewellery" is not wrong here. Step 5: Conclude that "Sedentery" is the only wrong spelling among the options.

Verification / Alternative check:
You can check related forms: "sedentary lifestyle" is a common collocation in health articles. You never see "sedentery lifestyle". Meanwhile, "business studies", "accurate information", and "gold jewellery" are all common phrases whose spellings are seen constantly in textbooks, newspapers, and digital content. This cross checking from memory reinforces that "Sedentery" is incorrect.

Why Other Options Are Wrong or Right:
- "Accurate": Correct spelling; no letters are misplaced.
- "Business": Correct spelling; learners sometimes misplace the "i" and "e", but this option is fine.
- "Jewellery": Correct British spelling with double "l".
Only "Sedentery" is wrong; the correct form should be "sedentary".

Common Pitfalls:
A common mistake is to doubt the spelling of "Jewellery" because of variations between British and American English. Exams in India typically follow British spelling unless clearly stated otherwise, so "Jewellery" is perfectly acceptable. Another pitfall is trusting your first impression rather than remembering patterns that adjectives ending in "ary" often share, such as "necessary", "primary", and "sedentary".

Final Answer:
The incorrectly spelt word is Sedentery; the correct spelling should be "sedentary".