Answer:
Statements I, II and V are true while III and IV are false
Step-by-step explanation:
Statement I - It is indeed true that Lincoln understood that the margin for error must be built into planning and departed the day before the ceremony.
Statement II- It is true that the Gettysburg Address indeed put "equality" in a new favoured position. The first part of the Address states that the founding fathers conceived a new nation dedicated to the proposition all men are created equal
Statement III- This is false because there were no specific mention of slavery, the Union, the South and the Emancipation Proclamation in the brief address
Statement IV: This false especially from the untrue statement that the address given by Abraham Lincoln was Lengthy. Abraham Lincoln arrived a day before and the address is reputed for being brief
Statement V: This statement is true, there are still myths around the composition of the speech. Abraham Lincoln is, in fact, a skilled orator who composed excellent speeches in his lifetime which are still being studied