In the sentences, certain words are in bold and numbered from A to H, which are the possible pairs to be interchanged. Choose the pair(s) of words that need(s) to be interchanged to make the sentence grammatically correct and meaningful.

a. A surge in India's oil imports from the United States ground (A) growth in shipments from its traditional suppliers in West Asia, after Washington imposed sanctions (B) on Tehran in November, according to tanker arrival data obtained (C) from sources. US President Donald Trump's administration renewed (D) sanctions against Iran last year over its nuclear programme.
b. While input prices are a better parameter (E) than taxation rates to determine ‘profiteering’, the outpaced (F) rule to be applied here is to allow free and fair play of market forces, and prevent (G) oligopolistic practices so that the consumer benefits (H)