(If you didn't know already )homosexuality is a very touchy subject to talk about for some people.
( )=these just mean that you could use it in the sentence
there you go...i hope its good
It would be primary since the writer himself is getting the information from a direct source.
The correct answer is Option: B) Implantation
Implantation is defined as the attachment of fertilized egg or blastocysts to the wall of uterus at the beginning of pregnancy. Occurrence of implantation ensures the women to be described as pregnant.
Other options are wrong.. e.g. Intercourse is only an act between a man and a woman and does not always result in a pregnancy. On the other hand menstruation has nothing to do witha women getting pregnant.