Before the inwention of the internet, letter writing was very popular. For friendship and for business people wrote letters by hand. Stores sold bowes of stationery to use for writing letters,
For ordinary mail, people wote on plain stationery made from wood pulp, for special letters and important documents, writers used
Stationery made from sice or parchment paper made from other materials. After writing a letter people could use a drop of hot wax to sealt
dosed

what are the question answer options?

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

c? not a 100% sure

explanation:

the correct answer would be d.