Correct Answer: Inauspicious

Solution : The second option is the correct answer.

The word propitious refers to something that is favourable, indicating conditions or circumstances that are likely to lead to success or good fortune. On the other hand, the most appropriate antonym, inauspicious implies conditions that are unfavourable or not conducive to success.

The meanings of the other options are as follows:

• Auspicious means favourable.
• Benign means kind, gentle, or favourable.
• Benignant is similar to benign meaning kind or gracious.

Therefore, the correct answer is inauspicious.