What does external mean?

[Henna]

English Language Tests, Intermediate level

ESL/EFL Test #172 "Reflexive and intensive pronouns", question 4

Divers use external air supplies to enable ......... to breathe under water.

(a) ourselves
(b) yourselves
(c) himself
(d) themselves

English Language Tests, Intermediate level

ESL/EFL Test #172 "Reflexive and intensive pronouns", answer 4

Divers use external air supplies to enable themselves to breathe under water.

Correct answer: (d) themselves
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what do external means

[Mister Micawber]

.
outside
.
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Native English teacher at Mister Micawber's

[Torsten]

Hello Henna,

Please note that your question should read What does external mean?

TOEIC listening, photographs: An outdoor market

[Molly]