There are many expressions such as - 'looking forward to, averse to, object to, prior to, etc.' that are commonly followed by a gerund. So, the use of 'detailed/prioritised' is inappropriate here. Options (b) and (c) are contextually incorrect, as the use of 'furnishing' and 'labelling' does not go with the meaning of the sentence.
Hence, option (a) is correct.
Note:
Gerund: Gerund is a verb form that functions as a noun, ending in -ing. A gerund can be either the subject or object of a sentence in English. Example: Everybody enjoyed her dancing and singing at the party. The words dancing and singing are gerunds.
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