The answer is D thanks (its in the title
a. Oral Sex - this still causes transfer of sexual fluids which can spread HIV. Technically if sexual fluids come in contact with toilet seats or clothing (underwear, etc), than HIV can be spread through those. But the chances of contracting HIV must be slim for those options since the fluids need to find a cut or an open blood vessel to enter.
Irony comes in three different forms and is used for a humorous effect. This is a rhetorical or satirical device in which the opposite of what was thought/intended happens