Concept:The word "concurrently" means happening at the same time.
Explanation:The underlined word "concurrently" describes two tasks being done together, not one after another.
Its nearest meaning is "simultaneously," which also means at the same time.
Option A "consecutively" means one after the other, so it is incorrect.
Option B "alternatively" means one instead of the other, so it is incorrect.
Option C "immediately" means without delay, which does not match the idea of doing tasks together.
Only option D gives the closest meaning.
Answer:D. simultaneously