Months starting with J = January, June and July
Months starting with A = April, August
Months starting with M = March, May
Jenny’s and Alice’s birthdays are two months apart
2 months from January = March. This cannot be correct
2 months from June = August. This can be correct
2 months from July = September. This cannot be correct
Hence, the only possibility is for Jenny to be born in June and Alice to be born in August.
Alice’s and Michael’s birthdays are five months apart
5 months after August = January
5 months before August = March
Hence Michael’s birthday is in March.
Difference between March and June = 3 months
This corresponds to C.