Which word is more formal: 'respond to' or 'answer'? ...

★ Narrative Tenses

Which word is more formal: ‘respond to’ or ‘answer’?

A. answer

B. respond to sb

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What is the correct meaning of the idiom ‘on the tip of my tongue’?

A. I can’t remember it at this moment, but I’m sure I will soon.

B. I’m terribly sorry, I got the wrong end of the stick.

C. It’s really hard for me to pronounce.

D. It’s too complicated and I can’t understand it.