What is the subject of the speaker's monologue in “my last duchess”?
a. a portrait of his wife
b. the speaker's memory of his wife
c. the father of the woman he wants to marry
d. someone who wants to marry his wife

The answer is indeed letter A. a portrait of his wife.

Explanation:

The poem "My Last Duchess", by Robert Browning, reveals the subject of the speaker's monologue in the very first line:

That’s my last Duchess painted on the wall,

Looking as if she were alive. I call

That piece a wonder, now; [...]

The probable speaker in the poem is the fifth Duke of Ferrara, Alfonso II d'Este. He married 14-year-old Lucrezia di Cosimo de' Medici, the duchess "painted on the wall". Rumor has it that she died at the age of 17 due to poisoning. Throughout poem, the Duke's arrogant and jealous nature can be noticed. His wife's beauty and happiness seemed to annoy him. The fact that her smiles were not directed only to him made him want to have them stop completely. He "gave commands" and the smiles did, in fact, stop.

Never to stoop. Oh, sir, she smiled, no doubt,

Whene’er I passed her; but who passed without

Much the same smile? This grew; I gave commands;

Then all smiles stopped together. [...]

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explanation:

b. cronkite, a trusted television personality, declared that the war was unwinnable and told the american people that the government had better find a way out

even though it went against everything the news anchors typically stood for, cronkite voiced an opinion and took a stance, telling the us that there was no way they were going to win, the war was going to end in a stalemate.