Select the option that expresses the given sentence in indirect speech.
Tanisha said to Priti, "I have been studying this complex problem for the entire week to find a solution."
1
Tanisha told Priti that she had been studying that complex problem for the entire week to find a solution.
2
Tanisha told Priti that she had studied that complex problem for the entire week to find a solution.
3
Tanisha told Priti that she had been studying this complex problem for the entire week to find a solution.
4
Tanisha told Priti that she was studying this complex problem for the entire week to find a solution.