"many" for countable nouns "much" for uncountable

Sometimes things get blurred, but this case is clear. "Questions" is a countable noun. How many questions did the teacher ask? "The teacher asked three questions." "The teacher only asked one question." So the correct expression is "how many." There's a third possibility. Suppose you've met me at a business meeting. In the US, it would be OK to ask me "What city are you from?" but it is not OK to ask "How many pounds do you weigh?" We can express this idea by saying 3. Don't ask people questions that are too personal. You have to use that word order; you can't say "Don't take people too personal questions."

The correct sentence is: 2. Don't ask people too many personal questions. Explanation: "Too much" is used with uncountable nouns (e.g., "too much water"). "Too many" is used with countable nouns (e.g., "too many books"). Since "questions" is a countable noun, "too many" is correct. Examples: Countable nouns: "too many apples," "too many options." Uncountable nouns: "too much coffee," "too much information."

2 is correct Because "too much'' + uncountable noun "People" can count

Number 2. is correct. With countable nouns, we use 'too many'. Because 'question' is a countable noun (1 question, 2 questions, 10 questions), we use too many: There are too many houses in this street. There are too many people in the theatre. 'Too much' is used for uncountable nouns: There is too much water in the glass. There is too much cheese in this sandwich. I hope that helps.