I promise. which statement best captures the meaning of the following lines about the golden brooch in, the courage that my mother had?

I have no thing to treasure more: /yet, it is something I could spare.
a. there are many things that I treasure more then the brooch
b. i treasure the brooch, but it is not my most valued possessions.
c. courage is important, but it cannot match the value of the brooch
d. I do not value the brooch highly, so I could easily live without it.

b.I treasure the brooch, but it is not my most valued possessions.

Explanation:

The line is taken from Edna St. Vincent Millay's short elegy poem "The Courage that My Mother Had". The poem is included in the collection "Mine the Harvest"  published in 1949, one year before the death of the poetess.

The line "I have no thing to treasure more:" shows that the poetess has nothing which she treasures more than the golden brooch, to simply mean that she treasures the golden brooch more than anything else.

The second line contrasts (also signified by the use of contrast word "yet") what is described in the first part. Here she says that she could still spare the brooch, meaning, she could leave it, or let it go (if she could get her mother's courage in return). Hence option B is correct.

Option A and D are completely incorrect stating opposite of what the poetess says and means in the given lines.

Option C is incorrect because firstly there is no mention of courage in these lines, secondly because, in next lines of the poem, we come to know she values courage more than the brooch.

c, his tragic flaw to cause his downfall