Answer:
The correct sentence is,
My friend and partner always helps me.
Explanation:
At first we have to know what 'concord' means:-
Concord means a state of agreement between subject and verb.
When subject of a sentence and verb of a sentence agree it is known as concord.
If the subject of the sentence is singular, the verb must be singular and if the subject of a sentence is plural, the verb must be plural.
In the above sentence 'friend' & 'partner' is referred to the same person which means a singular third person.
If the subject is in third person singular form then the verb is also be in singular form.
That's why the answer is,
My friend and partner always helps me.
Learn more about types of concord with example. Link is given below:-
https://brainly.in/question/13381995
Learn more about how to solve concord errors from the link given below:-
https://brainly.in/question/19780165