BastiG wrote:There is no rule whether c or d is right. I also can't think of any construction in the gmat where to + infintiv functions As a subject and where this construction is the critical factor.
Ron suggested that to + Infinitiv is used, when there is not a concrete noun such as love.
Example:
'to become a mother of six children was her greatest ambition
D) To have more than the usual number of fingers and toes (...) - Incorrect,
'to verb' is infinitive form of the subject requiring the action to be considered in the cause-effect relationship -->
(...)-
To have more than the usual number of fingers and toes on the hands or feet is termed polydactyly.
To know is to live --> cause=
to know, effect=
is to live
cause=
To have more than the usual number of fingers and toes, effect=possible [... is to have motor or sensory functions changed (one example)]
not effect attribute=
is termed polydactyly.
What Ron said in the prior posts might have distinct application though.