Which of the following is the best opening sentence for a business letter that you want to sound fairly informal?

a. this letter is to make you cognizant of our receipt of your order.
b. i am in receipt of your order of february 10.
c. your order of february 10 arrived in our office today.
d. be advised that i've just received your order.

100 points and brainiest for if u go to my previous questions u can answer the 100 pointers think of an intense argument you had or witnessed sometime in your life. close your eyes and remember every detail. to turn this into a dramatic scene you will need to make changes that will make it make more sense to the audience. 500-600 words a description of the set up that explains what happened before the scene diction that matches the characters character objectives and obstacles are clearly conveyed a scene that escalates in dramatic intensity diction that is appropriate to the audience words that are not wasted in idle chit chat action (stage directions) that enhance the scene proper formatting for drama