Answer:
Jesus.
Explanation:
"The Lamb" is the poem written by William Blake, published in the collection of poems of "Songs of Innocence".
The Lamb in the poem symbolizes Jesus Christ. In Christianity, Jesus Christ is referred to as a Lamb of God, who sacrificed His life for the mankind to save them from their sins. His sacrifice is considered to be perfect sacrifice. Now, we do not need any other animal sacrifices, but only by believing on the perfect sacrifice of the Lamb, i.e., Jesus, one can be saved.
The poet in the poem is referring to Biblical context, that Jesus created the mankind.
"Little Lamb who made thee " (Quoted Text from, "The Lamb")
So, the correct answer is second option, Jesus.