This is a question related to reported speech from my English exercise book:
Choose the best answer A, B, C or D to complete the following sentences:
The boy told us that he _____ for an examination next Monday.
A. sits
B. sat
C. is sitting
D. has sat
Because the examination will happen in the future time (next Monday), I can easily ignore option B (sat) and D (has sat). Also, I think option A (sits) may be fine because it talks about an event which is fixed, as in this example:
She has a yoga class tomorrow morning.
Source: http://www.ef.com/english-resources/english-grammar/simple-present-future-events/
How about option C (is sitting)? From my English grammar book, I know the present continuous tense can be used to talk about future plans or arrangements, but I just feel weird to use "is sitting" in this case. Does it sound natural to you?