Explanation

'Equipment' is an uncountable noun in English: it has no plural form, so 'equipments' is simply not a word. Uncountable nouns take singular verbs and singular determiners, as in 'the equipment is ready'. The word refers collectively to the items needed for a purpose. Hence part (a) contains the error, and 'equipments' must be replaced with 'equipment'. Option (A) is therefore correct.