Which of the following is a protected activity under Title VII's (the Civil Rights Act of 1964) antiretaliation provision?
A) An employer discriminating against an employee who opposes an employment practice that violates Title VII
B) A victim of sexual harassment at a workplace who seeks recovery under Title VII by suing the person who committed the harassment
C) An employer forcing a pregnant employee to take time off or quit
D) An employee filing a charge of workplace discrimination