In the following question, four words are given, out of which only one word is spelt incorrectly in standard English. Carefully read all four options and select the incorrectly spelt word.

Introduction / Context:
Spelling questions in competitive examinations test how familiar you are with the standard, dictionary approved forms of common English words. Here you are given four everyday words and asked to identify the one that is spelt incorrectly. Such questions look simple, but they are designed to catch very common spelling mistakes that people make in regular writing, especially with similar sounding vowels.

Given Data / Assumptions:

• You are given four options: Century, Finance, Remember, Sponser.
• Three of these words are correctly spelt in standard English.
• Exactly one word contains an incorrect spelling and must be selected as the answer.
• No tricky or rare meanings are involved; only the normal spellings of these common words are tested.

Concept / Approach:
The idea is to compare the spellings in the options with the spellings you have seen in books, newspapers and dictionaries. Century, Finance and Remember are very common and, as written here, match the standard spellings. The word related to someone who supports an event, a team or a person financially is sponsor, not sponser. The error lies in the vowel combination in the final syllable. Exam setters often test such near correct forms to check whether candidates have visually stored the right spelling in memory.

Step-by-Step Solution:
Step 1: Look at the word Century. You frequently see it used for one hundred runs in cricket or one hundred years in history. The spelling C E N T U R Y is correct. Step 2: Check Finance. This is a basic word in economics and business English, and the spelling F I N A N C E is the accepted form. Step 3: Check Remember. The spelling R E M E M B E R is very common and is correctly written in the option. Step 4: Check Sponser. You should recall that the standard word is sponsor, with O R at the end, not E R. The form S P O N S E R is wrong. Step 5: Because Century, Finance and Remember are correctly spelt while Sponser is not, Sponser is the incorrectly spelt word and is therefore the correct answer to mark in the exam.

Verification / Alternative check:
If you are in doubt, try forming common collocations in your mind: match sponsor, event sponsor, official sponsor. You will naturally visualise sponsor with O R. If you type Sponser into a word processor with spell check, it is usually underlined as an error, and suggestions like sponsor appear. No such red underline appears for Century, Finance or Remember, which shows those spellings are accepted. This provides an indirect verification that Sponser is wrong.

Why Other Options Are Wrong:
Century correctly represents the word for a period of one hundred years or a score of one hundred runs in cricket; there is no standard alternative spelling here.
Finance is correctly formed and appears in phrases like finance department, personal finance and finance minister; the spelling in the option is standard.
Remember is a basic verb of everyday English, and the given spelling is exactly the one you will find in any reputable dictionary, so it is not the incorrect option.

Common Pitfalls:
Many students rush through spelling questions and pick words that simply look unfamiliar, instead of carefully recalling where they have seen them in print. Another trap is to overthink common words such as finance and remember and start doubting correct spellings. Always calm down, recall real contexts in which you have read these words, and watch especially for subtle vowel changes near the end of the word, as in sponser versus sponsor. These little changes are where exam setters hide the error.

Final Answer:
The incorrectly spelt word is Sponser, which should correctly be written as sponsor.