Concept:"Much too" is used before an adjective or adverb to mean "excessively" or "to a great degree".
Explanation:The blank appears just before a descriptive word such as "hot", "weak", or "tired".
"Too much" is normally placed before uncountable nouns, not before ordinary adjectives.
"Much" alone is not strong enough here, and it does not commonly stand before a positive adjective.
"Very much" usually follows a verb or participle rather than preceding an adjective.
Only "much too" correctly joins "much" with "too" to show that something is more than acceptable or desirable.
For example, "much too hot" means "excessively hot", which fits the intended meaning perfectly.
Answer:D. much too