There were a lot of interactions between the two bases, which is how

Question

There were a lot of interactions between the two bases, which is how they stumbled across each other – although neither remembers the exact moment

A) There were a lot of interactions between the two bases, which is how they stumbled across each other – although neither remembers the exact moment

B) There were a lot of interactions between the two bases, that is how they stumbled across each other – although neither remembers the exact moment

C) There was a lot of interaction between the two bases, that is how they stumbled across each other – although neither remembers the exact moment

D) There was a lot of interaction between the two bases, which is how they stumbled across each other – although neither remembers the exact moment

E) There was a lot of interaction among the two bases, which is how they stumbled across each other – although neither remember the exact moment

vv65 · Accepted Answer

Eliminate B and C because
"That is how the stumbled across each other" is an independent clause, so B and C are run-on sentences (comma splice, to be more precise)

Eliminate E because the right idiom is BETWEEN THE TWO BASES, not AMONG THE TWO BASES
Use BETWEEN when you're talking about two things, and AMONG when you're talking about multiple things

Left with A and D now
The sentence says WHICH IS HOW THEY ...
So WHICH must refer to a singular noun
What is responsible for their stumbling upon each other? The INTERACTION is responsible
In answer choice A we would get "...INTERACTIONS is how they..."
In answer choice D we get "... INTERACTION is how they..."

Answer choice A has a subject-verb error

The right answer is D

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prathameshrathi · Answer

what is the rule? There  was a lot of interaction  or there  were a lot of interactions ?

MI800byNik · Answer

We use which when information in the restrictive modifier is not important and that when it is. Check 1. 
'was' singular interaction between two bases makes sense, rather than 'interactions'. Hence scored C

a9urag · Answer

How can which modify interaction when it is placed next to bases?
The only reason why I eliminated all the "which" options.
Moreover, how are we going to choose between interaction and interactions?
Expert help required

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Ritesh92gmat · Answer

vv65 · Answer

Number 1: 'which' must refer to something singular, but 'bases' is plural
Number 2: Look to the meaning : what is the reason for their stumbling on to each other?
The reason is the interaction

vv65 · Answer

In a case like this, when WHICH needs to be singular and the immediately preceding noun is plural, we need to go further back in the sentence

This is an exception to the rule that WHICH modifies the noun just before it

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pradeepgontla · Answer

I can see many questions over here but the answers available are limited so felt like sharing my view.

There were a lot of interactions between the two bases, which is how they stumbled across each other – although neither remembers the exact moment

In this question I've found in the non underlined part that "neither remembers the exact moment"

Which means there is clearly only one interaction then only this sentence make sense { Eliminate A,B}

A) There were a lot of interactions between the two bases, which is how they stumbled across each other – although neither remembers the exact moment-  Reason mentioned above

B) There were a lot of interactions between the two bases, that is how they stumbled across each other – although neither remembers the exact moment Reason Mentioned above

C) There was a lot of interaction between the two bases, that is how they stumbled across each other – although neither remembers the exact moment  That should used in cases that are specific, So eliminate C

D) There was a lot of interaction between the two bases, which is how they stumbled across each other – although neither remembers the exact moment

E) There was a lot of interaction among the two bases, which is how they stumbled across each other – although neither remember the exact moment { among is wrong usage for two bases}

VerbalBot · Answer

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There were a lot of interactions between the two bases, which is how

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There were a lot of interactions between the two bases, which is how

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