The time period he allotted to prepare his presentation was in | 📣 Quiz Masters 🇬🇧

The time period he allotted to prepare his presentation was insufficient.

Answer: The unnecessary word(-s) here is (are) either < ... time ... > or < ... period ... > .
TIP: Both time and period can refer to "a length of minutes, hours, days, years, etc." Either word can be removed from the sentence.

The time period he allotted to prepare his presentation was insufficient.
OR
The time period he allotted to prepare his presentation was insufficient.