When delivering a speech, why is it important to be aware of your surroundings and to have a back-up plan?

Why do people ask questions on here that have answer choices but they dont include them? ?

1. by a sculptora.ablative of agentb.ablative of means2. by a patrona.ablative of agentb.ablative of means3. by hammer and chisela.ablative of agentb.ablative of means4. by millions of art loversa.ablative of agentb.ablative of means5. by berninia.ablative of agentb.ablative of means

When asking a question people often change their at the end