1 Competitive advertisement is an aggressive form of marketing and is quiet different for creative a...........

Explanation:

Sentences 2 and 3 are grammatically correct and have similar meaning. Both of them are conveying the fact that the purpose of creative advertisement is to just entertain the viewer. But comparative advertisement is much more aggressive than that.
Let’s look at the errors in the other statements:
Sentence 1: In this sentence two wordsquiet and soul, are used incorrectly. Quiet means making little or no noise. Since an emphasis is being put on how different the two types of advertising are, the correct that should have been used is 'quite'. Quite means 'to a certain or fairly significant extent or degree'. 'Soul' means the spiritual or immaterial part of a human being or animal,
regarded as immortal. Since we need an adjective for 'purpose', the correct word that should have been used here is 'sole',
which means one and only.
Sentence 4: 'Might' indicates that the action(entertaining) is a future event. When we state future progressive events
as such, we use be + ing-verb. Also, when pointing out one among many, the  noun for many part (form) should be in
plural form. So, it should be 'forms' not 'form'.
Sentence 5: Even though is used in the sense of 'despite of'. Even though is used generally used when we are conceding a
surprising outcome. 'While' is used when two actions are happening simultaneously. Since two conditions are being compared without any conceding, we should use 'while' instead of 'even though'.
Hence, the correct answer is B.