Water itself is not technically wet but it can
make other things wet. Water really likes to
stick together because of it’s cohesive
properties. That’s why when you drop water on
a table, it sticks together in little droplets.
It’s held together by something called surface
tension. When water hits the shirt, the
surface tension releases and it will “wet” the
surface and absorb into the shirt. So to answer
your question, B (shirt) will only get wet if
it comes into contact with A (water).