A sales proposal is likely to be considered as effective when it $\_\_\_\_\_.$

a$.$

uses the same template for all customers

b$.$

is written in a flat and technical manner

c$.$

appropriately assumes what is important to a buyer, without asking the buyer

d$.$

requires interpretation by the customer due to usage of the seller's company jargon

e$.$

has a logical flow that a customer can easily follow