A difficult question in my opinion. Let’s examine the details section first.
David has sent Wenqi an email with an attachment 附件[fùjiàn] containing a schedule.
The subject 主题[zhǔtí] is a business meeting 商务会[shāngwùhuì]。
In the email, David writes that he has sent the meeting schedule 会议[huìyì]日程表[rìchéngbiǎo]，and says it’s what he and Director Qian 钱总 agreed on 商定[shāngdìng]。
He asks Wenqi to add 加上[jiāshàng] the opposing 对方[duìfāng] speech 发言[fāyán] titles 题目[tímù]，and to send it back to him.
So our options for this question are as follows:
The receiver 收件人[shōujiànrén] should：
A. Add 补充[bǔchōng] to the attachment
B. Go discuss/negotiate 商量[shāngliáng] with Director Qian
C. Give the speech to Wenqi
Or D. Prepare 准备[zhǔnbèi] the meeting speech. So obviously, the answer is A.