Select the correct indirect form of the given sentence.
I said to Prachi, “I visited Maldives last week.”

Correct option is C

The correct indirect form of the sentence is (c) "I told Prachi that I had visited Maldives the previous week." This maintains the correct tense shift from direct to indirect speech.
Rules for converting direct speech to indirect speech-
· When the reporting verb of direct speech is in past tense then all the present tenses are changed to the corresponding past tense in indirect speech. 
· In indirect speech, tenses  do not change if the words used within the quotes (‘’) talk of a habitual action or universal truth.
· The  tenses of direct speech do not change if the reporting verb is in the  future tense or  present tense. 
· Reporting verbs such as ‘said/ said to’ changes to said, told.
· Comma inverted comma will be replaced with conjunction “That”.
· The  first person in direct speech  changes as per the subject of the speech.
· The  second person of direct speech  changes as per the object of reporting speech.
· The  third person of direct speech  doesn’t change.
· “Last week” changes to “the previous week”.