Meaning of "I should be there at about five o'clock"

[Elga]

English Language Tests, Intermediate level

ESL/EFL Test #144 "Question / Response Test", question 1

When do you have to pick John up at the airport? ..........

(a) He flew into the international airport
(b) I don't think she's coming
(c) I should be there at about five o'clock

English Language Tests, Intermediate level

ESL/EFL Test #144 "Question / Response Test", answer 1

When do you have to pick John up at the airport? I should be there at about five o'clock.

Correct answer: (c) I should be there at about five o'clock

Your answer was: incorrect
When do you have to pick John up at the airport? I don't think she's coming.
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Meaning of "I should be there at about five o'clock"?

Elga

[Yankee]

Hi English Learner!

The easiest explanation is:
The question is 'when'? (When do you have to pick John up at the airport?)

The only sentence that gives you a 'when' answer is (c) five o'clock.

Additionally, the question refers to the future. Answer (a) is a past tense sentence (flew), so, also for that reason, it doesn't fit the question.

Hope that helps
Amy