Read the given statements carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the inferences can definitely be drawn from the statement(s).
Statements:
1. All the students passed the examination.
2. Some of the students are girls.

All the students passed the examination.

Some of the students are girls.

As per the  given statements, what we infer is 

Both boys and girls students are there and none of the students have failed the exam.

Thus, the correct option is B.