In the following sentence, choose the alternative that best improves the bracketed part. They will not be able to enjoy these benefits (up and until) they part with their personal biometric information to the government.

Introduction / Context:
This question tests familiarity with the correct correlative expression "unless and until". The sentence says, "They will not be able to enjoy these benefits (up and until) they part with their personal biometric information to the government." The bracketed phrase is non standard. We must choose a more idiomatic way to express the condition under which they will be able to enjoy the benefits.

Given Data / Assumptions:

• The basic structure is "They will not be able to enjoy these benefits ... they part with their personal biometric information".
• The bracketed phrase "up and until" is not the standard form.
• Options include:
  • till and until
  • unless and until
  • uptil and until
  • No improvement
• The intended meaning is that they will get the benefits only if or only when they part with their biometric information.

Concept / Approach:
We should:

• Identify whether the sentence expresses a pure time limit or a conditional restriction.
• Recall the standard compound conjunction used in such contexts.
• Reject spellings or combinations that are incorrect in formal English.

The phrase "unless and until" is widely used to convey a strong conditional requirement that must be satisfied before something can happen.

Step-by-Step Solution:
Step 1: The meaning of the sentence is conditional: they will not enjoy the benefits unless they share their biometric information. It is not merely saying "up to a point in time". Step 2: Option B "unless and until" captures both the conditional and temporal aspect and is the standard expression in legal and formal writing. Step 3: Option A "till and until" is redundant because "till" and "until" convey similar temporal meaning and do not express the conditional sense clearly. Step 4: Option C "uptil and until" is wrong in spelling ("uptil" is not standard) and again unnecessary duplication. Step 5: The original "up and until" is not idiomatic, so "No improvement" cannot be the answer. Step 6: Therefore, "unless and until" is the correct choice.

Verification / Alternative check:
Put each option into the sentence: They will not be able to enjoy these benefits unless and until they part with their personal biometric information to the government. This version clearly conveys the meaning that sharing biometric data is a necessary condition for receiving benefits. "Till and until" and similar combinations sound clumsy and do not capture the conditional nature so effectively. "Up and until" is simply incorrect usage and is not found in standard formal writing.

Why Other Options Are Wrong:

• till and until: Repetitive and does not emphasise the conditional requirement; both words have similar time related meaning.
• uptil and until: Contains a non standard spelling ("uptil") and still does not add any extra clarity over "until".
• No improvement: Rejects the need to correct a clearly awkward and non idiomatic phrase.

Common Pitfalls:
Learners sometimes confuse "till", "until" and "unless" and create hybrid expressions that are not accepted in standard English. Another common mistake is to assume that if a phrase is heard in casual speech it must be correct in written exams. However, examinations test the most standard and precise usage, and "unless and until" is the recognised pair for describing a strict condition that must be met before a result can follow.

Final Answer:
The correct improved phrase is unless and until, so the right option is "unless and until".