"he'll do right by her"

[Baubau]

English Language Tests, Intermediate level

ESL/EFL Test #703 "English Slang Idioms (445)", question 5

"I think Manuel is a good choice for Lilly. I'm sure he'll do ......... by her. He's a good guy, and anyone can tell that he cares about her a lot," Zack said to Marsha.

(a) sure
(b) right
(c) good
(d) handy

English Language Tests, Intermediate level

ESL/EFL Test #703 "English Slang Idioms (445)", answer 5

"I think Manuel is a good choice for Lilly. I'm sure he'll do right by her. He's a good guy, and anyone can tell that he cares about her a lot," Zack said to Marsha.

Correct answer: (b) right

Your answer was: incorrect
"I think Manuel is a good choice for Lilly. I'm sure he'll do good by her. He's a good guy, and anyone can tell that he cares about her a lot," Zack said to Marsha.
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Can someone please rephrase "he'll do right by her", I'm not sure I understand the meaning correctly.

Thanks in advance.

[Kitosdad]

The phrase has many uses, but within the context of the exercise, I would read between-the-lines and say,
The female is probably pregnant and the the man will do the moral thing and marry her.

Thus, "He will do right by her."
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