A series is given, with one word missing. Choose the correct alternative from the given ones that will complete the series.
EEEEEEEFF, EEEEEEFEF, EEEEEFEEF, EEEEFEEEF, EEEFEEEEF, ?

Each term consists of exactly 9 letters containing 'E's and 'F's. Let's observe the position of the first 'F' from the left:
* 1st term: EEEEEEEFF $\to$ 'F' is at 8th position
* 2nd term: EEEEEEFEF $\to$ 'F' is at 7th position
* 3rd term: EEEEEFEEF $\to$ 'F' is at 6th position
* 4th term: EEEEFEEEF $\to$ 'F' is at 5th position
* 5th term: EEEFEEEEF $\to$ 'F' is at 4th position

The first 'F' is shifting one position to the left in each step, while the last letter always remains 'F'. Following this rule, in the 6th term, the first 'F' will move to the 3rd position, which gives EEFEEEEEF.