Select the correct indirect form of the given sentence. “You speak su…

The correct answer is Option (2) → Mary told me that I spoke very good English.

Changing a statement said to "me" into indirect speech:

Change	Direct	Indirect	Why
Reporting verb	said Mary	Mary told me	Mary said these words to me, the person now reporting them. So "said" becomes "told me".
Joining word	" " (quotation marks)	that	A statement is joined with "that".
Pronoun change	You	I	Mary spoke to me. In my own report her "you" becomes "I".
Tense change	speak	spoke	The simple present "speak" becomes the simple past "spoke" after "said". The simple present is formed with the base form (V1), or V1 + s / es with he, she, it. The simple past is formed with the past form of the verb (V2).
Word of feeling	such good	very good	"Such" adds warm feeling in speech. A plain report uses "very" instead.
Full sentence	"You speak such good English," said Mary.	Mary told me that I spoke very good English.

"Told" always takes the person spoken to. "Said" is used when no person is named. Example: Mr Rao said to us, "You work hard." → Mr Rao told us that we worked hard.

Why the Other Options are Incorrect?

Option 1: Mary told me that I speak so much good English. — Incorrect. "Much" is not used before "good" and a noun. "So much good English" should be "very good English".

Option 3: Mary told me that I was speaking much good English. — Incorrect. "Much good English" is not correct English. "Good" takes "very" before it.

Option 4: Mary told me that I was speaking very good English. — Incorrect. "Speak" is the simple present. It moves back to the simple past "spoke", not to the past continuous "was speaking".