Why must problem solving follow goal solving to solve a real-life problem for a problem-solving agent in Artificial Intelligence?

Why must problem solving follow goal solving to solve a real-life problem for a problem-solving agent in Artificial Intelligence?

From the BUET MSC (CSE) October 2017 – Written exam, question 6 of 20.

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All questions in BUET MSC (CSE) October 2017 – Written