Not much analysis we can do on the question stem. So we move to question stem.
Staement 1 :
She was hired in the 2nd week of the monthAgain not enough info as it can be any month. So we move ahead.
We eliminate options A and D.
Statement 2 :
A day in April was exactly 100 calendar days after the day Mona was hiredWe need to approach them in a way to identify when she was hired. So what we can do is to find the latest day and the earliest day that she was hired.
Latest day:The latest day of hiring means that the day in the statement should be 30th April.
April has 30 days, March 31, Feb can have 28-29. If we add them we get 89 or 90 days.
So it means the latest she was hired was on the
21st of January as then we have 10 + 29 + 31 + 30 days after that.
Earliest day:The earliest day can be when the day in the statement is the 1st of April.
So we have 31 + 28 + 31 (The reason we take 28 days in April is that we want to find the earliest day) = 90 days here.
It means we can go on 21st of December here. (10 + 90 gives us 100)
Again not sufficient. We eliminate options B.
CombineWhen we combine we know it has to be the second week of January.
Option C.