Although appearing less convincing

[krrishna.chirumamilla]

Although appearing less convincing than most of their broad and big A14 class cousins, A13 class cars, made from parts built from a technologically advanced process -- they are often slim and sleek, or have plenty of patches and scars-- A13 are more desirable and thus in increasing demand.

A. Although appearing less convincing than most of their broad and big A14 class Cousins, A13 class cars, made from parts built from a technologically advanced process
B. Although A13 class cars, made from parts built from a technologically advanced process, appear less convincing than most of their broad and big A14 class cousins
C. Although they appear less convincing than most of their broad and big A14 class cousins, A13 class cars, made from parts built from a technologically advanced process
D. Made from parts built from a technologically advanced process, A13 class cars appear less convincing than most of their broad and big A14 class cousins
E. A13 class cars, made from parts built from a technologically advanced process, although they appear less convincing than most of their broad and big A14 class cousins

Hi Ron, Could you please explain the difference between options B and D. Some say both are correct grammatically but from meaning perspective, only B is correct as D changes the meaning.
And some say in D, there is a mistake in joining the independent clauses.

Which one is true and what should we learn from this particular question?

Thanks in advance.

[RonPurewal]

This is not a GMAT Prep problem.

I don't know where you got this problem, but it's an obvious rip-off of #132 in the 13th edition official guide. Forget this problem and just study the official one instead.