Final answer:
The establishment of equal rights legislation is an example of progress toward removing systematic discriminatory practices against homosexual and bisexual individuals. So, the correct option is c) establishment of equal rights legislation.
Step-by-step explanation:
An example of progress toward removing systematic discriminatory practice against homosexual and bisexual individuals is the establishment of equal rights legislation (c). This legislation aims to protect the rights and ensure the equality of these individuals in schools, the workplace, and the military. For instance, the overturning of the controversial 'don't ask, don't tell' policy in 2011 allowed homosexuals in the US military to openly disclose their sexuality, removing the discriminatory practice of hiding their identity.