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The highlighted part is incorrect as 'grinding' is not suitable in the context of the sentence. 'Ground', as a verb, can mean 'prohibit or prevent (a pilot or an aircraft) from flying'. 'Grounding', the gerund form, should be used to make the sentence correct; so, A is incorrect. B is incorrect as 'subsequently' is an adverb and cannot qualify the noun (gerund) 'grounding'. We need to use 'subsequent' - an adjective - here. In D, the presence of 'in' is unnecessary and hence it cannot replace the highlighted part. Option C is the right answer.
20% of 1500 – 75% of 200 = 125% of ?
33 × ?2 – 6 × 5 = 3270
(25 + 12) x 6 + 34 = ? + 18
2.4 of 7.2 of 1/57.6 of 4200 = ?
Evaluate: {2 x (0.718 + 0.982) + 0.008 of 5000}
(8.4 × 6.5 ×2.52 )/(5.04 ×3.25 ×2.1) = ?
√ (573 – 819 + 775) = ? ÷ 3
25% of 440 + 88 X (1/2)2 - 28 = 8 X ?
(2/3) × (5/7) × (3/4) × ? = 80