In metalwork one advantage of adhesive-bonding over spot-wel

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In metalwork one advantage of adhesive-bonding over spot-welding is that the contact, and hence the bonding, is effected continuously over a broad surface instead of a series of regularly spaced points with no bonding in between.

(A) instead of
(B) as opposed to
(C) in contrast with
(D) rather than at
(E) as against being at

I'm confused between B and D. Can any experts help?
Source: — Sentence Correction |

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by GMATGuruNY » Sun Nov 26, 2017 4:21 am
When you post an SC, please underline the relevant portion.
In metalwork one advantage of adhesive-bonding over spot-welding is that the contact, and hence the bonding, is effected continuously over a broad surface instead of a series of regularly spaced points with no bonding in between.

(A) instead of

(B) as opposed to

(C) in contrast with

(D) rather than at

(E) as against being at
A: THE CONTACT is effected continuously instead of A SERIES
B: THE CONTACT is effected continuously as opposed to A SERIES
C: THE CONTACT is effected continuously in contrast with A SERIES
In these answer choices, a reader might construe that THE CONTACT is being compared to A SERIES -- an illogical comparison.
Eliminate A, B and C.

E: is effected CONTINUOUSLY as against BEING at a series of points
Here, being serves as the object of the preposition against.
The object of a preposition must be a NOUN.
An adverb such as continuously cannot be compared to a noun such as being.
Eliminate E.

The correct answer is D.

D: The contact is effected CONTINUOUSLY rather than AT A SERIES OF POINTS.
Here, one adverb (continuously) is compared to another (at a series of points).
This comparison makes sense.

Note the following:
To show PREFERENCE in a comparison, the GMAT tends to use rather than.
I discuss the difference between instead of and rather than here:
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