Identify the error in apostrophe use in the sentence. If there is no error, choose no error.

LETS remember that THERE’S going to be a meeting at six O’CLOCK.

O Lets
O there's
O O'clock
O no error

The error in apostrophe use in the sentence is in "O'clock". The correct way to write it is "o'clock" without the capitalization of the "O". The correct sentence would be:

LET'S remember that THERE'S going to be a meeting at six o'clock.