Explanation:

The correct answer is option 'D' - futile.

Meaning of the word 'futile':
Futile means something that is incapable of producing any useful result or achieving its intended purpose. It refers to an action or effort that is pointless, useless, or ineffective.

Explanation:
In the given sentence, it is stated that her attempt to appear in the examination was useless. This implies that her effort or action did not yield any positive outcome. Let's break down the sentence to understand it better:

- "It was a useless attempt": This indicates that the attempt made by the person was not successful or productive. The word 'useless' suggests that it was not worthwhile or beneficial.
- "on her part to appear in this examination": This suggests that the person made an effort to participate in the examination, but it did not result in any positive outcome.

Therefore, based on the context and the meaning of the word 'futile', option 'D' is the correct answer as it accurately describes the situation where the attempt made by the person was ineffective and pointless.

Key Points:
- The attempt made by the person was unsuccessful.
- It did not produce any positive result.
- The action or effort was pointless and ineffective.

Usage of Other Options:
- Option 'A': Fruitful means producing good or positive results. Since the attempt was useless and did not yield any positive outcome, this option is incorrect.
- Option 'B': Unjustified means not shown to be right or reasonable. While the attempt may not have been justified due to its lack of success, it does not accurately convey the meaning of the sentence.
- Option 'C': Future refers to a time period yet to come. This option does not accurately describe the situation mentioned in the sentence.
- Option 'E': Last refers to something that comes after all others. This option does not convey the meaning of the sentence, which indicates that the attempt was futile and unsuccessful.