Select the most appropriate option to substitute the underlined segment in the given sentence. If no substitution is required, select 'No replacement required'.

The operative narrowly escaped to be detained by coastal guards while navigating near the border.

The correct option is being detained by coastal guards.

Explanation:
1. Verb Pattern: The verb "escape" is followed by a gerund (an -ing verb form), not an infinitive (to + verb). Therefore, using "to be detained" after "escaped" is grammatically incorrect.
2. Passive Voice: Since the operative receives the action of detainment by the coastal guards, the passive form of the gerund is required. The passive gerund form is being + past participle (V3), which yields "being detained".
3. Corrected Sentence: "The operative narrowly escaped being detained by coastal guards while navigating near the border."