Answer :
The answer is B. Many students envied Isabela's ability to run hurdles, throw the javelin and do running in the relay race.
That last verb should be "run" to parallel the rest of the verbs.
The sentence which lacks parallel structure is:
- B.Many students envied Isabela's ability to run hurdles, throw the javelin and do running in the relay race.
What is Parallel Structure
This refers to the way a text is arranged to make the words have similar structure and arrangement.
Based on this and from the available options, we can note that option B does not make use of parallel structure because of how it uses different structures to describe Isabela's abilities.
Read more about parallelism here:
https://brainly.com/question/10517884