As we can say that ,
Elusive is antonym word of Tangible .

Correct Option: B

As we can say that ,
Tangible means available physically, concretely, elusive is something that eludes, i.e, is difficult to catch, touch or understand, palpable is a synonym to tangible.
Hence , Elusive is antonym word of Tangible .

As we know that ,
Liability is opposite word of Asset

Correct Option: B

As we know that ,
Asset means a useful property of a person, liability means a debt or an obligation, credibility means believable, prosperity means progress.
Hence , Liability is opposite word of Asset .

As we can say that ,
Turncoat is antonym word of Confident .

Correct Option: A

As we can say that ,
Confident is the person you tell your secrets and who keeps that secret, turncoat is a person who changes allegience from one to another and does not remain loyal, arrogant means rude, firm means strict and strong, confederate means joined by a treaty or agreement.
Hence , Turncoat is antonym word of Confident .

As we know that ,
Lavish is opposite word of Scrimp .

Correct Option: A

As we know that ,
Scrimp means to live on very little money and Lavish is to live extravagantly, i.e., spending a lot of money, parsimonious are means for making money.
Therefore , Lavish is opposite word of Scrimp .

As we can say that ,
developed is opposite word of Rudimentary .

Correct Option: A

As we can say that ,
Rudimentary means still in the initial stage, developed will be opposite to this.
Hence , developed is opposite word of Rudimentary .