an effective way to handle a tired and cross customer is to

a.ask the customer what is wrong
b.remain perfectly still
c.remain pleasant and cheerful
d.calm the customer with your calmness
my answer is c

the ultimate moment of the sales presentation is
a.determining the customers needs
b.overcoming objections
c.the closing of a sale
d.the demonstration of product knowledge
my answer is c

I agree with both your answers.