Below are some sentences out of which the sentence numbered 4 has been…

Answer: The sixth statement is "The problem with discrimination now is that it has become more subtle."

Correct ordering of the sentences and brief justification for the flow:

1. Discrimination is the action of showing biased preference for one over another.

2. It is a word commonly taught in academia.

3. It is a word taught to help children be aware of the harms of it.

4. What is not taught is that it continues on the sidelines.

5. It is far from being eradicated.

6. The problem with discrimination now is that it has become more subtle.

7. However there are some still openly discriminating without facing repercussions and it needs to be tackled with equal force.

Explanation of the transitions:

• Start with the definition to introduce the topic (definition sentence).

• Follow with the academic context to show where the term is commonly discussed.

• Then note how it is taught to children, continuing the educational tone.

• The given sentence about it continuing on the sidelines shifts to the idea that teaching alone doesn't stop it.

• State that it is far from eradicated to strengthen the claim.

• Provide the specific observation that discrimination has become more subtle, illustrating the previous point.

• Conclude by noting that some still discriminate openly and that such behaviour must be tackled.

Therefore, the sixth sentence in the logical order is the one stating that discrimination has become more subtle.