Correct option is A
The correct option is (a) Anbu told Suresh that Priya was playing in the garden.
Tense change: "Is playing" (present continuous) changes to "was playing" (past continuous) in indirect speech.
Pronoun change: No pronoun change is needed.
Time clause change: No time expression, so no time clause change.
Reporting verb change: "Said to" changes to "told" for indirect speech.
Corrected sentence: Anbu told Suresh that Priya was playing in the garden.