Virginia and her brother William disagree over when their father was born: Virginia claims it was in 1935 and William claims it was in 1933. The hospital where their father was born has no records for 1933 but has complete records for 1935—records that do not include a birth record for their father. Therefore, he must have been born in 1933.
The argument depends on which of the following assumptions?
Solution: Just while reading the conclusion of the argument itself, one can't help but notice why only those two years. Are the kids really sure about the year and it's either 1933 or 1935 or are they just guessing but the correct year is something else?
(A) Either Virginia's claim or William's claim is correct.:
Exactly what we require. Correct(B) The records of the hospital where their father was born date back to 1933.:
Goes against the premise. Hospital has no records of 1933.
(C) Virginia and William know the day and the month of their father's birth.:
The argument is about the year, not day or month.(D) There are urgent practical reasons why Virginia and William must know the date of their father's birth.:
That's the most irrelevant option I have ever read.(E) None of their other relatives knows the year in which Virginia and William's father was born.:
I take back my statement above, this is the most irrelevant option I have ever read.