Explanation

The correct sentence is:

A) Irrespective of the diverse opinions, the committee has convened to discuss the pressing issues.

Here's a breakdown of why this is correct:

• "Irrespective of" is a prepositional phrase that correctly modifies the entire clause.
• "The committee" is a singular subject, so the verb should be singular as well: "has convened."

The other options have either grammatical errors or incorrect usage of the prepositional phrase.