Answer:
Excitatory, causing depolarization
Step-by-step explanation:
Depolarization: The term depolarization is defined as a process through which different cells experience a membrane potential change. Depolarization leads to the swap of the electric charge in the cells that causes to leave a few negative charge into the cell.
Excitatory neurotransmitter: It creates a signal named as action potential in any of the receiving neuron. These neurotransmitters cause excitatory consequences on the neuron i.e, it increases the probability of a neuron to release an action potential.
In the question above, the effect of the neurotransmitter on the receiving neuron is excitatory that causes depolarization.