Answer: C) Most fruits and vegetables are low in calories, making them a healthy and delicious part of any diet.
Explanation: a particular tendency, trend, inclination, feeling, or opinion for or against one person or group, especially in a way considered to be unfair, preconceived or unreasoned. From the given options, the sentence yhat contains an element of bias is the corresponding to option C, because saying that fruits and vegetables are a "delicious part of any diet" is giving a personal opinion (it isn't based on facts).