What is the reason that transport vesicles is accurately docked at target organelles?(   )
A、v -SNARE is on the transport vesicles and t-SNARE is on the target organelle, the two molecules is able to identify and associate. 
B、t -SNARE is on the transport vesicles and v-SNARE is on the target organelle, the two molecules is able to identify and associate. 
C、t -SNARE is on both the transport vesicles and the target organelle, the two molecules is able to identify and associate. 
D、v -SNARE is on both the transport vesicles and the target organelle, the two molecules is able to identify and associate.