Thom Hollis Works as a Financial Advisor for TD Bank

Thom Hollis works as a financial advisor for TD Bank Financial Group. His job involves providing investment advice to many clients, in person or on the phone, and writing many letters and e-mails. He has an appointment tomorrow with Ji-Wan, a client, to review her personal investment portfolio. Before she comes in, Thom has to review her profile, decide what changes to suggest, and put together a proposed portfolio. He has a recent finance diploma, but because he is still relatively new to his job, he wants to collect as much information as he can on appropriate investments for her, so he decides to send an e-mail to Alyson, his manager, to see if she has any suggestions or advice. Besides preparing for his meeting with Ji-Wan, Thom has several other tasks he must work on.
-Which version of the following sentence did Thom likely keep as the most effective use of what your text calls concrete language?

A) I offer my clients valuable investment advice.
B) I usually help my clients make substantial gains in their investment portfolios.
C) My clients have responded positively when asked whether my services have helped them to make money.
D) An independent audit shows that my clients have realized an average growth in their investment income that is higher than the industry average.