Concept:The sentence needs a tense that shows an action continuing from the past into the present.
Explanation:The phrase "was leading" is in the past continuous tense.
It describes an action that was ongoing in the past, but it does not connect clearly to the present moment.
The sentence states that the new CEO was appointed last year and is still actively working.
Also, the employees "remain" resistant now, which shows the situation continues in the present.
So the present perfect continuous tense "has been leading" is the correct choice.
This tense shows an action that began in the past and is still continuing.
Option A "had been leading" is past perfect continuous, which suggests the action was completed before another past event, not suitable here.
Option C "is leading" is simple present tense, but it does not show the continuity since last year.
Option D "will be leading" refers to the future, which is not relevant to this sentence.
Option E is incorrect because the original phrase "was leading" does not match the present context.
The correct sentence is: The new CEO, who was appointed last year to address the company’s declining profitability, has been leading the organization effectively and implementing several new measures, but some employees remain resistant to change.
Answer:Option B — "has been leading" is the correct replacement.