The right response is WORST. Since there are more than two objects being compared, it must be a superlative rather than a comparative.
The correct response is LITTLE because A LITTLE simply signifies that some attention was paid; it has no negative connotations. LITTLE denotes a negligible amount, giving the sentence its intended negative meaning.
The correct response should include a different preposition that comes after DEALS: DEALS WITH.
The infinitive was used in place of a gerund, and the correct response is DELAYED BUYING. The gerund -ing comes after the verb DELAYED.
Don't combine two MODAL verbs in this manner. MIGHT COST is the right sentence construction.
It is a participle, not a verb tense, and should read PHASING to maintain its parallel structure with NOT AGREEING.
DRASTICALLY is an adverb, but an adjective is required. The correct spelling of the term is DRASTIC.