Correct option is A
The correct indirect form of the sentence is "The teacher said that too many cooks spoil the broth."
Direct speech- Direct speech, also known as quoted speech or direct quotation, is a way of reporting someone's exact words.
Indirect speech- Indirect speech, also known as reported speech or indirect quotation, is a way of reporting someone's words or thoughts indirectly, without using their exact words.
· In indirect speech, tenses
do not change if the words used within the quotes (‘’) talk of a habitual action, universal truth or a proverb.
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Too many cooks spoil the broth is a proverb which means if too many people are involved in a task or activity, it will not be done well.