In the following sentence, the bracketed part is grammatically incorrect. Choose the option that best improves the sentence: (Like instance), you can reduce or increase your total deposit amount some time or even change the sum fixed.

Introduction / Context:
This question focuses on the correct fixed expression used to introduce an example in English. The sentence is about the flexibility of adjusting a deposit amount, and the phrase in brackets aims to introduce an example of such flexibility. You must select the standard, idiomatic phrase used in formal and informal English when presenting an example.

Given Data / Assumptions:

• Original sentence: "Like instance", you can reduce or increase your total deposit amount some time or even change the sum fixed.
• The phrase is at the beginning of the sentence and introduces a particular case.
• The context is financial advice or explanation of deposit schemes.
• We are looking for a common and correct introductory phrase.

Concept / Approach:
The standard phrase in English to introduce an example is "For instance". It is equivalent to "for example". Expressions such as "Like instance", "As instance", or "In instance" are not idiomatic and do not appear in correct written English. Therefore, the best option is "For instance". This small but important collocation is widely used and is considered correct in exams and formal writing.

Step-by-Step Solution:
Step 1: Recognise the function of the bracketed phrase: it introduces an example.Step 2: Recall the standard expressions "for instance" and "for example" used in this function.Step 3: Compare the options and identify "For instance" as the correct and complete phrase.Step 4: Replace the incorrect phrase with "For instance": "For instance, you can reduce or increase your total deposit amount some time or even change the sum fixed."Step 5: Confirm that the sentence now starts smoothly and clearly introduces an illustrative situation.

Verification / Alternative check:
If you read the sentence with "As instance" or "In instance", the phrase immediately sounds wrong and unnatural. "Like instance" is clearly incorrect and likely a mis-learnt fragment. Exam questions frequently test such formulaic expressions because they easily separate candidates who read widely from those who rely only on literal translations. When you see a phrase that looks similar to a known expression but feels slightly off, you should suspect it and compare it with the standard form you know.

Why Other Options Are Wrong:

• Option A: "As instance" is not a standard phrase; it lacks the article and does not match normal English usage.
• Option C: "In instance" is also incorrect; the usual pattern "in this instance" is different and requires a determiner.
• Option D: "No improvement" would preserve "Like instance", which is ungrammatical and non-idiomatic.

Common Pitfalls:
A typical pitfall is to accept phrases that resemble correct ones, especially if learners have memorised them incorrectly. For expression based questions, developing a sense of what you have actually seen in credible texts is crucial. When in doubt, try substituting the expression with "for example". If the rest of the sentence still makes sense, you likely need "For instance" or "For example" instead of a distorted or incomplete version.

Final Answer:
The correct improvement is For instance.