Identify the part of the following sentence that contains grammatical error.
'These kind of dresses seem to be expensive but it is relatively economical to maintain them.'
(a)
(b)
(c)
(d)
Answer Options:

The correct answer is Option A ((a)).

Key Points:
• In English, plural demonstrative determiners ('these', 'those') must modify plural nouns ('kinds', 'types', 'sorts').
• Singular 'this/that' modifies singular 'kind/type/sort'.
• Part (a) contains 'These kind of dresses', which is grammatically erroneous. It should be either 'This kind of dress' or 'These kinds of dresses'.
• Therefore, part (a) contains the error.
• Key Takeaway: Use 'This kind of' or 'These kinds of'; 'These kind' is grammatically incorrect.