Usage of IF and When on the GMAT.
In conditional statements, ‘if’ and ‘when’ can be used interchangeably – but only in certain cases.
‘If’ and ‘when’ can be used interchangeably when we present conditions in which the outcome is definite or the outcome is a general fact. i.e. if event A happens, event B happens.
Example : We know as a general fact that water evaporates when it is heated.
If you heat water, it evaporates. – CORRECT
When you heat water, it evaporates. – CORRECT
When can you not use ‘when’ in place of ‘if’?
When ‘if’ conditional statement is used to express a situation in which the outcome is a possibility and not a certainty, ‘when’ cannot be used in place of ‘if’.
Example: Possibility of going to fair
Morgans may go to the fair, if the weather is bright and sunny. – CORRECT
Morgans may go to the fair,
when the weather is bright and sunny. – INCORRECT
key takeaways
If the conditional statement expresses a general fact ‘if’ and ‘when’ can be used interchangeably.
If the conditional statement expresses a possibility, ‘when’ cannot be used in place of ‘if’.
Source credit:
https://e-gmat.com/blogs/if-vs-when/Applying the concept to solve this question:
We cannot use when here because we do not know for certain whether the outcome making the pilgrimage is certain.
Left with A C E.
affordable(adjective) vs afford(verb)
Dictionary meaning of affordable is inexpensive; reasonably priced.
As per the meaning of the original sentence, Making the pilgrimage to Mecca at least once in a lifetime, if affordable
inexpensive or reasonably priced, is one of the five obligations of devout Muslims.
Who decides whether the pilgrimage is affordable or not?
Who reckons whether they can afford the affordable pilgrimage?
This option does not answer those questions. Option C answers it and therefore is the winner.