Select the correctly spelt word.

The correct answer is Surveillance.

Explanation:
The word Surveillance means the close observation of a person, group, or area, especially under suspicion or for security purposes.

Spelling Breakdown:
• Prefix & Root: Derived from French surveiller (where sur- means 'over' and veiller means 'to watch').
• Double Consonant: It uses a double 'll'.
• Suffix: It ends with the suffix '-ance' (not '-ence').
• Correct Structure: S-U-R-V-E-I-L-L-A-N-C-E.

Analysis of Incorrect Options:
• Surveilence: Incorrect suffix ('-ence') and missing the second 'l'.
• Surveilance: Missing the second 'l'.
• Surveillence: Incorrect suffix ('-ence').