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1. Isn't the usage of to produce incorrect in E as to verb is generally used when we need to present the purpose or the intention of an action?
While the infinitive ("to + verb"), when used as an adverb, is often used to describe the intent of an action, it doesn't have to. Here's a simple example: "Carbon and oxygen combine to form carbon monoxide." That seems fine to me, even though carbon and oxygen are not conscious entities scheming to form a toxic gas. (At least not to my knowledge. :idontknow: ) The meaning in this example is probably closer to "results in" than "intent." This is similar to what we find in (E).
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2. Also, shouldn't a comma always precede which?
Any "rule" involving commas is going to have exceptions. Typically, yes, when "which" is used as the subject of a clause, it will follow a comma. So for the purposes of this problem, it is legitimate to eliminate (C) and (D) on the basis of the faulty "which" usage.
However, if "which" is used as the object of a preposition, it won't follow a comma. For example: "Here is the sewer in which I dropped my wedding ring." (Fun fact: a good friend of mine proposed to his wife using a ring he found in a sewer in New York City. I am not making this up. They've been married for more than 50 years now.)
I hope that helps!
For my information, would it be correct if I ask the question ''Why'' to the verb of the clause to identify whether ''to+verb'' is acting as an adverb or not. If I am able to answer this question with the help of ''to+verb'' infinitive form , that means , it is used for indicating intention or purpose of an action. Could this litmus test be used ? I checked this with few questions and it worked, I am not sure if it is some std rule or not.