In exocytosis, the membrane package fuses with
the nucleus
the cell membrane
a transport protein
a gap junction

The correct answer is the plasma membrane.

Exocytosis is the process by which substances are excreted or exported out of the cell. These substances are exported with the help of membrane bound transport vesicles.

Cargo or substance needed to be exported are packaged into the transport vesicles with the help of Golgi apparatus.

These vesicles then flow towards the plasma membrane.

The membranes of the vesicles then fuse with the plasma membrane.

It provides the cargo the passage to move out of the cell .i.e. cargo is secreted out of the cell.

it would be c. xylem.

b is the best answer for this question.