For a voluntary, elective course, no problem - as long as all three sites are required to be attended equally, and valid justification exists for visiting these sites by the specific course curriculum.
But as a general school requirement? Where only the mosque is mandatory? Are you kidding me?
The mandatory field trip mandates visiting all three locations. The girls are required to wear mohammedan-specification clothing during their visit to the mohammedan hellhole. They are not required to do anything special during their visit to the synagogue or the cathedral.
Journalists don't know how to write.