Read the sentence carefully and choose the grammatically correct alternative. They claim that their employees are highly committing and disciplined. Which of the following phrases should replace the underlined part to make the sentence correct and natural in standard English?

Introduction / Context:
This is a sentence correction problem that checks your understanding of correct verb forms and collocations in English. The sentence is They claim that their employees are highly committing and disciplined. You must select the alternative that makes the sentence grammatically correct and idiomatic. Such questions are common in verbal ability sections of competitive exams and language proficiency tests.

Given Data / Assumptions:

The main sentence structure They claim that their employees are ... and disciplined is acceptable.
The problematic phrase is highly committing which sounds unnatural in this context.
We have four alternatives that offer different verb forms and structures.
The intention is to say that employees show strong commitment and discipline continuously.

Concept / Approach:
In English, we normally describe people as committed rather than committing when we want to show that they are dedicated or loyal. Highly committed is a standard adjective phrase meaning very dedicated. The present continuous form committing would usually refer to performing an action such as committing a crime, which does not fit here. Therefore, the correct solution is to use the adjective committed with the existing verb are to form are highly committed, which matches number and tense correctly.

Step-by-Step Solution:

Verification / Alternative check:
A good way to verify is to read each option in full within the sentence. Options that change the tense unnecessarily or create awkward phrasing should be discarded. When you insert are highly committed, the sentence reads naturally and matches the intended meaning. Native usage strongly favours the form highly committed employees rather than highly committing employees, which confirms that option are highly committed is the best and grammatically correct choice.

Why Other Options Are Wrong:

Have been highly committed changes the tense to present perfect, which does not match the simple present claim and also alters the flow of the sentence.

Have high commitments uses the noun commitments, which is grammatically possible but does not sound as natural as committed when describing employees traits in this context.

No correction required is incorrect because the original phrase highly committing is not idiomatic and does not accurately convey the idea of dedicated employees.

Common Pitfalls:
Students sometimes accept awkward sounding phrases as long as they look grammatically possible. In usage questions, both grammar and natural expression matter. Another pitfall is not reading the entire sentence with each option, which can make a slightly wrong answer appear acceptable. Always read the full sentence aloud in your mind with each alternative and prefer forms that are both grammatically correct and idiomatic in standard English.

Final Answer:
The phrase that should replace the underlined part is Are highly committed.