In which part of the ginger piece do you
notice growth occurs?

when you push away the soil from around the rhizomes, you'll notice that Ginger rhizomes look knobby.

Explanation:

you will also see Roots reaching outwards and downwards from the rhizomes. The rhizomes edible portion of ginger.

i make a call from my car.

ok i dont know what b says but d is the only one that sounds some what like an aperitivo