The error is present in part C of the sentence. In the given sentence either we will use 'friendlier' or 'more friendly'. 'Friendlier' is a comparative adjective so it does not need the addition of 'more'. 'More' is used with positive degree adjectives to form their comparatives.
Hence, option (a) is correct.
Note:
· The Positive Degree of an Adjective is the Adjective in its simple form. It is used to denote the mere existence of some quality of what we speak about. It is used when no comparison is made.
· The Comparative degree of an adjective denotes a higher degree of the quality than the positive and is used when two things are compared.
· The Superlative degree indicates the highest degree of the quality and is used when more than two things (or sets of things) are compared.
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