A.I. Explanation:

Option 1: "True talent is enough for attaining great heights"

Explanation: This option is incorrect because the text emphasizes that talent alone is not sufficient for success. The speaker clearly states that both talent and confidence are necessary, indicating that relying solely on talent will not lead to great heights.

Option 2: "Hard work is enough for attaining great heights"

Explanation: This option is also incorrect as the text suggests that hard work, while important, is not enough on its own. The speaker highlights the need for confidence in addition to hard work to achieve true success.

Option 3: "A person simply cannot expect to achieve the true heights"

Explanation: While this statement is partially true, it lacks completeness. The text specifies that without confidence, a person cannot achieve great heights, but it does not imply that one cannot achieve anything at all. Therefore, this option does not capture the full essence of the speaker's message.

Option 4: "Confidence is necessary for attaining great heights"

Explanation: This option is correct as it directly reflects the main message of the text. The speaker asserts that confidence, alongside talent and hard work, is essential for achieving success. The phrase 'minimum level of confidence' indicates that without it, one cannot reach their full potential, thus supporting the idea that confidence is a necessary component for attaining great heights.