Voice
In the following question, a sentence has been given in Active/Passive Voice. Out of the four/five alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice. He was only ten years old when he composed this poem.
He was only ten years old when this poem had been composed by him.
He was only ten years old when he could compose this poem.
He was only ten years old when the poem has been composed by him.
He was only ten years old when the poem was composed by him.