In the following sentence reordering question, the parts of a sentence are labelled P, Q, and R. Reorder the parts to form a meaningful and grammatically correct sentence. Accepting that one form P of price discrimination is okay opens Q the door to all other forms R of discrimination as well.

Introduction / Context:
Sentence rearrangement questions test a learner ability to recognise logical and grammatical order in English. Here, a sentence about price discrimination and discrimination in general has been split into three labelled parts. The candidate must decide in which order P, Q, and R should follow the introductory phrase to produce a clear and correct statement.

Given Data / Assumptions:

• The fixed opening is Accepting that one form.
• Part P is of price discrimination is okay opens.
• Part Q is the door to all other forms.
• Part R is of discrimination as well.
• The final sentence must be meaningful and grammatically correct.

Concept / Approach:
We need to build the sentence slowly, using both meaning and grammar. After Accepting that one form, we must specify what the form is. Part P begins with of price discrimination, which fits naturally, resulting in Accepting that one form of price discrimination is okay opens. Then we need to state what this acceptance opens. Part Q contains the phrase the door to all other forms, which directly follows opens in a natural collocation opens the door to. Finally, Part R completes the phrase all other forms of discrimination as well. Therefore, the logical order is P, then R, then Q in relation to the introductory portion, but we must check how the parts are actually joined.

Step-by-Step Solution:
Step 1: Attach Part P to the introductory chunk: Accepting that one form of price discrimination is okay opens. Step 2: Notice that the verb opens usually takes an object such as the door to something. Step 3: Combine the phrase opens the door to, which comes from opens plus the first words of Part Q: the door to all other forms. Step 4: Finally, attach Part R to complete the noun phrase: of discrimination as well, which correctly modifies all other forms. Step 5: Putting this together, the full sentence is Accepting that one form of price discrimination is okay opens the door to all other forms of discrimination as well, which corresponds to the order PRQ.

Verification / Alternative check:
We can test other sequences to see why they fail. For example, PQR would give opens the door to all other forms of discrimination as well out of order if we join incorrectly, or QRP would begin with the door immediately after Accepting that one form, which breaks the phrase structurally. Only PRQ produces a fluent sentence where each phrase follows gracefully and grammatically from the previous one.

Why Other Options Are Wrong:
Option a, QRP, would place the door to all other forms right after the opening phrase, creating Accepting that one form the door to all other forms, which is incorrect. Option b, RPQ, starts with of discrimination as well, which cannot follow one form directly. Option d, PQR, misplaces R, disrupting the natural pairing opens the door to. Option e, RQP, begins with of discrimination as well immediately after the opener, which makes no sense. None of these orders preserve both the collocation of opens the door to and the logical flow of the sentence.

Common Pitfalls:
A common mistake is to focus purely on meaning without noticing fixed expressions such as opens the door to, which must stay together. Another pitfall is ignoring how prepositional phrases like of price discrimination and of discrimination as well must attach to the correct nouns. Careful attention to collocations and to the roles of prepositions can greatly improve performance in paragraph and sentence jumbles.

Final Answer:
The correct order of the parts is PRQ, giving the sentence Accepting that one form of price discrimination is okay opens the door to all other forms of discrimination as well.