Answer: Alex tells a story about his brother that causes his friends and family in the audience to laugh.
Step-by-step explanation:
The statement that describes a strategy that Alex could use to deliver a lighter speech will be for Alex to tell a story about his brother that causes his friends and family in the audience to laugh.
It's but proper for Alex to tell an embarrassing joke about his brother. Also, preparing a long statement to be delivered when it's time to toast can make the event boring.
Therefore, the correct option is A.