vasuca10 - looking at your doubt I would like you to find out where you went wrong. here are few pointers to help you to do that.
1. use of Both - Both X and Y - Here X and Y must be parallel to each other. Have you identified X and Y and their parallelism ? If you do this You can eliminate A,B,C.
2. Between D and E you can easily eliminate E. Let me know if you need help with that.
Regarding Meaning, Always break the sentence in basic parts. Keep the subject and main verbs, and object but Drop the prepositional clauses etc. Try to figure out the meaning of this then one by one put dropped elements back in the structure and meaning can be understand. For solving most SC questions I use following syntax. I suggest you to have a syntax for yourself, make one what suits you the most. Now, I care for your learning and that is why saying it - No matter how easy/difficult question is, follow the syntax. When you make a comment/ ask question follow this order, this will make me understand, where things went wrong. Most people stuck one score for years, dont know how to improve. Most of the time when you follow rules, you will get answers on your own. I gave you the direction, I hope you will get your path. Ask me any pending doubts you have.
4-Step Approach to tackle any SC question, without getting confused:
Step 1: Read the sentence completely and try to understand the intent and meaning, while identifying the error(s)
Step 2: Once you identify one error, eliminate all the answer choices that contain the same error
Step 3: Identify and eliminate answer choices that correct the original error but introduce other error(s). You can compare the options vertically to make this process easier.
Step 4: Verify your answer choice by substituting and checking the complete sentence for compliance with GMAT rules of grammar and the intended meaning.