According to the logic used in the first pair, replace the question mark with the appropriate option

Host ∶ Aircraft ∶∶ Receptionist ∶ ??  

Host ∶ Aircraft

The relationship between the terms in the first pair is 'Host' and 'Aircraft'. The logic connecting these terms is that a 'Host', or more specifically, an 'Air Host', typically works within an 'Aircraft'. They are the key participant in the working environment of an 'Aircraft'.

Using the same logic for the second pair 'Receptionist' and '??',

we can infer that we're looking for the typical working environment of a 'Receptionist'. And the typical working environment for a receptionist is an 'Office'.

Hence, the answer is 1) Office.