Answer:
D. Curry was very honest and dependable.
Step-by-step explanation:
The quote "Roosevelt always referred to Curry as "straight as a string," means that Curry was an honest and dependable person.
The idiom 'straight as a string' means straightforward and outright. By referring to Curry as straight as a string, Roosevelt is describing him as an honest and dependable person. One who speaks outrightly, without compromising with the truth.
Therefore, option D is correct.