The rhyme scheme in the first stanza is?

Read the poem and answer the question

I’m going soldering:
Mad the rhythm runs
With drumming and with trumpeting
And glory of the guns.

I’ve come home again:
I know that blood is red;
I know how sodden falls the rain
Where flesh lies dead.

A. aabb
B. abab
C. abbaa
D. aabc

Correct Answer:

Option B – abab