Although appearing less appetizing than most of their round and red supermarket cousins, heirloom tomatoes, grown from seeds saved during the previous year – they are often green and striped, or have plenty of bumps and bruises-heirlooms are more flavorful and thus in increasing demand.

A Although appearing less appetizing than most of their round and red supermarket cousins, heirloom tomatoes, grown from seeds saved during the previous year
B Although heirloom tomatoes, grown from seeds saved during the previous year, appear less appetizing than most of their round and red supermarket cousins
C Although they appear less appetizing than most of their round and red supermarket cousins, heirloom tomatoes, grown from seeds saved during the previous year
D Grown from seeds saved during the previous year, heirloom tomatoes appear less appetizing than most of their round and red supermarket cousins
E Heirloom tomatoes, grown from seeds saved during the previous year, although they appear less appetizing than most of their round and red supermarket cousins
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This Questions becomes very easy if 2 things are known - sentence structure & focus on meaning.
The intended meaning: It presents a contrast. Although heirloom tomatoes appear less appetizing than their supermarket cousins (fact), they are more flavorful & in increasing demand (is the contrast).

Splitting the sentence:
1. Although appearing less appetizing than most of their round and red supermarket cousins, heirloom tomatoes, grown from seeds saved during the previous year. SV error. No verb for subject Heirloom tomatoes.
2. they are often green and striped, or (they) have plenty of bumps and bruises. SV pair looks ok.
3. heirlooms are more flavorful and thus in increasing demand. SV pair in agreement.
Pronoun "they" logically refers to noun heirloom tomatoes, because author is presenting a fact/contrast about heirloom tomatoes.

POE:
(A) Although appearing less appetizing than most of their round and red supermarket cousins, heirloom tomatoes, grown from seeds saved during the previous year. No verb for this clause.
(B) Although heirloom tomatoes, grown from seeds saved during the previous year, appear less appetizing than most of their round and red supermarket cousins. Correct choice with proper SV Pair.
(C) Although they appear less appetizing than most of their round and red supermarket cousins, heirloom tomatoes, grown from seeds saved during the pervious year. No verb for noun heirloom tomatoes
(D) Grown from seeds saved during the previous year, heirloom tomatoes appear less appetizing than most of their round and red supermarket cousins. This sentence seems grammatically correct (other than usage of ; ) but loses the contrast per original sentence..
(E) Heirloom tomatoes, grown from seeds saved during the previous year, although they appear less appetizing than most of their round and red supermarket cousins. This seems again IC and Heirloom tomatoes has no verb
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yes option D is run on sentence;two independent clause can not placed without connecting conjunction , make subordinate one to other main clause ,or place semi colon (;) between two independent clause.

thanxxx

I want to point out one thing about the use of ‘although’ in this sentence. 'Although,' as a subordinate conjunction is used to introduces a clause having a subject and verb. In choice A what accompanies is a participial phrase with no working verb; So it is ungrammatical
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Hi all
good discussion on an excellent question....
Here is my take on it.....
A,C and E are out as the clause starting with Although is a dependent clause and does not has a verb.
Remaining are B and D...
Finding it difficult to eliminate D.......I think "Gown from seeds....." is a dependent clause as the meaning is not clear it just states grown from seeds saved ....It depends on the following clause for its complete meaning i.e. what is grown....

Moreover B conveys clear contrast and is correct with subject verb, hence went to select B

Awesome question, +1

Fell into the trap. Picked D. Thanks for the explanations!