Ａ． お時間を取ってもらったお礼「今日はお忙しい中、お打ち合わせの機会をいただき、ありがとうございました」
Thank you for taking your time to meet with us today.

または、

Thank you very much for giving us an opportunity to introduce ourselves today.

丁寧に言いたい場合に、

It was nice of you to take your time to meet with us today.
I would like to express our appreciation for taking your time to meet with us today.

今後の取引の検討を促す「ご検討のほど、何卒よろしくお願いいたします」
一番一般的で、無難なのは、
We look forward to your positive response.
Looking forward to working with you.
Looking forward to your giving serious consideration in ......

などでしょう。