Select the most appropriate word to fill in the blank and make a meaningful sentence.

The diamond necklace is too ___________ for me.

extravagant

The most appropriate word to fill in the blank is extravagant.

The sentence is about how the diamond necklace is too expensive for the speaker. The word "extravagant" means "spending money or resources in an unrestrained, wasteful, or lavish way." This is the most appropriate word because it accurately describes the diamond necklace.

The other words are not as appropriate.

• Luscious means "extremely pleasing to the senses, especially the sight or taste." This does not make sense in the context of the sentence, because the speaker is not talking about the necklace being pleasing to the senses, they are talking about it being expensive.
• Insufficient means "not enough." This does not make sense in the context of the sentence, because the speaker is not saying that the necklace is not enough, they are saying that it is too much.
• Austere means "severely simple or plain." This does not make sense in the context of the sentence, because the diamond necklace is not simple or plain, it is expensive.