By understanding the meaning of the words.
Sow means planting. " I sow the seeds in the soil".
Sew means to stitch. "She sews her seams sweetly and neatly".
The meaning of the poem shows a word "independence" which is opposite to our feelings... she used the symbol "hero" to describe what there is in people's inside(heart).
B.Explains why the paper is written.
Hope this helps(this statement is overused)
Give more context please?
They use all of them except a