Final answer:
The correct conversion into indirect speech is 'She says that schoolwork frustrates her,' because the original statement is in the present tense and the reporting verb 'says' is also in the present tense.
Step-by-step explanation:
To convert the statement into indirect speech, you maintain the present tense used in direct speech since the reporting verb 'says' is in the present tense. Therefore, the correct conversion of 'She says, 'Schoolwork frustrates me.' into indirect speech is option (a): 'She says that schoolwork frustrates her.' This format respects the rules of reported speech which, in this case, requires no change in tense because the reporting verb is in the present.