Directions: Given below are three sentences, one or more of them is incorrect. Identify the one(s) that are incorrect.

(A) The gap between exports and imports widened to USD 31.02 billion in July from USD 26.18 billion in June.

(B) But international oil prices have cooled since then, eroding profit margins of both oil producers nor refiners.

(C) The tax on exports has been raised as cracks or margins rose but the same on domestically produced oil was reduced as international oil prices slid to a six-month low.