People with 新完全マスター文法 N2 please help me

So I recently got 新完全マスター文法 textbook, and reading the first few grammar points I can understand them but I don’t understand the exercises and why some answers are considered incorrect

For example the first grammar point
〜際(に)
『名』ーの ・『動』辞書形/た形+際(に)

練習三番目のは
( )際は、こちらのテーブルを使いいただけます

A お食事の B ご飯を食べる Cお一人様

My first question is why on this grammar does it suddenly change to 際(は)and

second is why is A (according to the textbook) correct? Aren’t B and C also grammatically correct or am I misunderstanding something?

Same with 〜とたん(に)
『動』た形+とたん(に)

練習一番目
( )とたん、眠くなった。
A勉強が終わった B勉強をした C勉強をしていた

Again the answer is A, but why isn’t B or C correct?

The textbook doesn’t really explain why it’s A nor why the others are incorrect, can anyone help me out?

by amenoyouni

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