You are experimenting on 3 neurons in a brain slice that obey Hebbian principles of synaptic plasticity. Neurons 1 and 2 form separate synapses onto Neuron 3. If neurons 1 and 2 fire simultaneously and an action potential results in neuron 3, you might expect that

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Hebbian theory suggests that if a neuron successfully contributes to firing another neuron, the synapse between them is strengthened. Since neurons 1 and 2 fire simultaneously and cause neuron 3 to fire, the synapses from both neurons 1 and 2 onto neuron 3 would be strengthened, making neuron 3 more easily depolarized by future stimuli from either neuron 1 or 2. The other options involve relationships not directly explained by Hebbian principles in the context given.

You Are Experimenting on 3 Neurons in a Brain Slice