Ican hardly remember what i did before i got my own personal computer. not only does it improve the quality and efficiency of my homework, the games i play are really cool. i also like to surf the internet in search of websites about interesting topics such as skateboarding and rollerblading.
which would be the best topic sentence for the paragraph?
a) last night i looked for information on tony hawk.
b) my mom and dad never had a computer when they were young.
c) having my own computer has made life so much easier and much more fun.
d) computer use should be monitored by parents at all times to protect their children.

my guess is c.

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.

it probably should so i can spam dank memes