Which sentence contains an error in parallel structure?
a builders need to be good at planning and calculating.
b my youngest brother is a singer, dancer, and paints.
d the resort's pool water was warm, salty, and soothing.
d zoos should keep animals safe, healthy, and well-fed.

"B My youngest brother is a singer, dancer, and paints." is the sentence with the error.

Explanation: The reason why is because parallel sentences must stick with the form it started with. If all the other predicate adjectives are adjectives, then there cannot be a noun in the list of predicate adjectives. If the nouns end in -ing then all of other nouns in that list must end in -ing. All parallel sentences must stay in form with each other.

answer = d. hope this . : -d