In the following question, four words are given. Identify the word that is incorrectly spelt according to standard English usage.

Introduction / Context:
Spelling questions test a learner's attention to detail and familiarity with common but sometimes tricky English words. Here four words are presented, and the task is to pick the one that is incorrectly spelt. This type of question often targets words with double consonants or unusual vowel patterns that many candidates confuse in writing.

Given Data / Assumptions:
- We are given four options: Tomorrow, Occurence, Temperature, Preferable.
- Only one of these words is not spelled correctly in standard English.
- The other three reflect correct dictionary spellings.

Concept / Approach:
The idea is to mentally compare each option with the spelling that you have seen in reliable sources such as textbooks, newspapers or dictionaries. Words like “tomorrow” and “occurrence” are notorious for confusion around double letters. A systematic check of each option helps avoid guessing purely by appearance.

Step-by-Step Solution:
Step 1: Check option A: “Tomorrow”. The correct spelling of the word for the day after today is t-o-m-o-r-r-o-w, with a double r in the middle. The option matches that form, so it is correct. Step 2: Check option C: “Temperature”. The common noun for degree of heat or cold is spelt t-e-m-p-e-r-a-t-u-r-e. The option is correctly written. Step 3: Check option D: “Preferable”. The adjective meaning more desirable is spelt p-r-e-f-e-r-a-b-l-e. The given option is correct. Step 4: Check option B: “Occurence”. The standard spelling of this noun is “occurrence” with a double r: o-c-c-u-r-r-e-n-c-e. The option has only one r after “cur”, so “Occurence” is incorrect. Step 5: Conclude that option B is the only incorrectly spelt word among the four.

Verification / Alternative check:
Consulting a reliable dictionary shows the correct form as “occurrence”. The pattern is: occur (verb) plus the suffix -ence, in which the r is doubled. In contrast, “Occurence” drops one r and does not match the dictionary, confirming that it is a misspelling. The other options appear exactly as in standard references.

Why Other Options Are Wrong:
In this question, “wrong” refers to using them as the answer. They are correct spellings, so they are not the required incorrect option.
- Tomorrow: standard spelling, very common word.
- Temperature: correct spelling of the scientific term.
- Preferable: standard adjective form with the suffix -able.

Common Pitfalls:
Candidates sometimes incorrectly think “tommorow” or “temperatue” are acceptable forms, but exam setters usually choose correct versions for these to avoid confusion. The real trap here is the missing r in “Occurence”, which looks almost right at a quick glance. Carefully checking double consonants is a good habit when answering spelling questions.

Final Answer:
The incorrectly spelt word among the options is Occurence (correct form: “occurrence”).