Correct Answer: (a) too much windy
Solution:We use "too much" before uncountable nouns like too much money(uncountable), too much milk, etc. However, "too many" is used before countable nouns like too many shoes (countable), too many books, etc. But, in the given sentence, 'windy' is not a noun it is an adjective. So, we will remove 'much' before 'windy'. Hence, either 'too windy' or 'too much wind(noun)' is the most appropriate structure.