Introduction / Context:
This error-spotting item tests subject–verb agreement when the subject is a gerund phrase. In English, a gerund phrase (verb-ing used as a noun) is singular and therefore typically takes a singular verb form.
Given Data / Assumptions:
- The full subject is “Motivating employees with traditional authority and financial incentives”.
- The predicate uses “have become”, a plural verb form.
- We must check whether the head of the subject is singular or plural.
Concept / Approach:
- A gerund phrase functions as a singular noun (e.g., “Running is fun”).
- Modifiers within the gerund phrase (e.g., prepositional phrases like “with … incentives”) do not change the number of the head noun.
Step-by-Step Solution:
Identify the grammatical head: “Motivating …” is a gerund functioning as a singular subject.Match the verb to a singular subject: “has become”, not “have become”.Therefore, the error is in the segment “incentives have become”. It should read “incentives has become” only if “incentives” were the subject, but it is not. The correct overall clause is “Motivating … has become increasingly difficult.”
Verification / Alternative check:
Replace the subject with a simple singular noun: “Activity has become difficult.” This confirms the singular agreement.
Why Other Options Are Wrong:
A and B are modifiers of the gerund; they are fine.D is a correct adverbial complement.E is wrong because an agreement error exists in C.
Common Pitfalls:
Being distracted by plural-looking nouns inside a gerund phrase and mistakenly using a plural verb.
Final Answer:
incentives have become
Discussion & Comments