Which sentence demonstrates correct subject-verb agreement? a. dave wiens, a denver native and champion mountain biker, design the olympic mountain bike course in atlanta, georgia. b. exploring international mountain passes, such as those in new zealand, canada, and japan, are one of the biker’s favorite hobbies. c. wiens’s competitors, such as john tomac and mike kloser, inspires him to train more aggressively. d. knee injuries, neck and back pain, and weakness in the hands develops when poor bike training is used.

A. Dave Wiens, a Denver native and champion mountain biker, helped design the Olympic mountain bike in Atlanta, Georgia.

Explanation:

When a sentence is composed of a subject, two or more nouns or pronouns and when these are joined by the conjunction 'and', then  the verb form will comply in numbers to the performer(s) of the action - the subject.

Therefore, Dave Wiens helped design the Olympic mountain bike in Atlanta, Georgia, where a subject pronoun complies with helped design ( composite past tense of help  + (to has been suppressed)  design ( infinitive form).

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alright no problem, cool