With reference to the first blank, only 'ingenious' willwork. 'ingenious' means showing inventiveness and skill.So C is correct for the first blank.'ingenious' and 'ingenuous' means lacking in canningguile or worldliness; innocent candid or naive. 'Credible'means capable of being believed; believable or plausible.'imperious' means commanding haughty and arrogant.Hence (A), (B) and (D) will not the first blank.Let us attempt to fill 2nd blank. The word 'furrows'points is to the correct option, which is 'corrugated'meaning, 'folded'. 'Crenelated' meaning, 'havingbattlements; indented notched, 'crinkled' meaning 'Toform wrinkles or ripples' and 'crimped' meaning to pressor pinch into small regular folds or ridges' arecontextually inappoririate.