More important than winning is developing the ability to work with others ... ...

Determine whether or not there is an error in the underlined portion of the sentence above. If there is no error, select answer choice "A".
(A) More important than winning is developing the ability to work with others and developing leadership skills.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Press: Set B - Subject-Verb Agreement