The correct option is C Saturday
Radhika goes to temple every two days so, after Sunday she'll go to the temple on Tuesday, Thursday and Saturday.
The same can be obtained by application of multiples of '2'.
The mulitples of '2' are 2, 4, 6, ........ . Hence, she visits the temples on Tuesday, Thursday and Saturday.
Radhika goes to the temple every three days so, after Sunday she'll go to the park on Wednesday and Saturday.
The same can be obtained by application of multiples of '3'.
The mulitples of '3' are 3, 6, ........ . Hence, she visits the temples on Wednesday and Saturday.
The common multiple of both '2 'and '3' is 6. As she visited both places on sunday, therefore, she'll go to both places on Saturday which is 6th day from sunday.