What is the best way to revise this sentence so that it conveys clear, concise ideas and does not change the meaning of the sentence?

i rang the doorbell, but no one came to the door, and i was sure that this was the right address, so i waited, and then i saw a curtain move.

a. i rang the doorbell, and i saw a curtain move upstairs.
b. the curtains moved in the window the moment i rang the doorbell.
c. i was sure i was at the right address, but no one came when i rang the bell.
d. i rang the doorbell, but no one came to the door. i was sure this was the right address. while i waited, i saw a curtain move.

The missionaries who appear in the novel are colonists from a) britain b) portugal c) spain d) italy

Read the sentence. the great wave was inexpensive to purchase, costing only about the same as a double of noodles. since lots of copies could be printed and still look good, it made loads of money. which best revises this sentence to create a more formal style and tone? *the great wave was as cheap as buying a double of noodles. since lots of copies could be made and still look great, people started making piles of money. *the great wave was inexpensive to purchase, costing about the same as a double of noodles. since mass quantities could be produced and still look exquisite, it became highly profitable to sell. *the great wave cost next to nothing, practically the same as a double of noodles. since mass quantities could be produced and still look awesome, it became highly profitable to sell. *the great wave was inexpensive to purchase, similar to buying a double of noodles. since lots of copies could be made that still looked amazing, those who sold it made tons of money.

Which event occurred in the nearly two-year time span between act 3 and act4 of the tragedy of julius caesar?