Which of the following sentences shows correct capitalization?

Question

Stanley said, “doctor Livingstone, I presume?”

Stanley said, “doctor livingstone, I presume?”

Stanley said, “Doctor livingstone, I presume?”

Stanley said, “Doctor Livingstone, I presume?”
a b c or d

Answer 1

The sentence that shows correct capitalization is:

Stanley said, “Doctor Livingstone, I presume?”

So the answer is:

d