I think green peppers out of all them goodluck sorry if I’m wrong :/
C. Sensitivity
because this isn't a constant thing, so it isn't a. it isn't b. and it isn't d.
Males get very aroused around their partner they find sexually attractive and the male sex hormone known as testoterone is going crazy. If you want a more specific answer I'd reccomend researching the male anatomy.
The second trimester is when the respiratory system is mature.