(A) an epidemic that does
(B) not discriminate based
(C) obesity has been declared
(D) on age, gender, or ethnicity

In the following question, a grammatically correct and meaningful sentence is given which is divided into four parts namely (A),(B),(C) and (D). Arrange these four parts to make a contextually and grammatically meaningful sentence.

The correct option is CABD.

Let's analyze the given sentence fragments step-by-step to form a grammatically correct and logically coherent sentence:
(A) an epidemic that does
(B) not discriminate based
(C) obesity has been declared
(D) on age, gender, or ethnicity

Step 1: Identify the subject of the sentence
Part (C) introduces the main subject and predicate: "Obesity has been declared". This serves as the starting point of the sentence.

Step 2: Connect the subject to its descriptor/noun complement
Following part (C), we need to know what obesity has been declared as. Part (A) provides this continuation: "an epidemic that does". Thus, C connects smoothly to A ("Obesity has been declared an epidemic that does...").

Step 3: Complete the verb phase and preposition
Part (B) naturally completes the verb started in part (A): "not discriminate based". Joining A and B gives: "...an epidemic that does not discriminate based..."

Step 4: Provide the object of the preposition
The preposition "based" requires a prepositional phrase, which is completed by part (D): "on age, gender, or ethnicity".

Putting all the parts together in the sequence C → A → B → D yields the meaningful sentence:
"Obesity has been declared an epidemic that does not discriminate based on age, gender, or ethnicity."