How to use preposition ?​

Prepositions are always used to indicate the relationship of a noun or phrase to something else. When using a preposition, you must always have the subject and verb before it, and follow it with a noun. You should never follow it with a verb! 

Explanation:

Prepositions are words that are used to link a noun or phrase to another part of the sentence. Some examples of prepositions are “on”, “in”, “to” and “at”.

free time is when all my homework and chores have been done for the day and i am "free" to do things that i enjoy doing.

usually i spend time watching television. as my favorite tv shows come on at specific times, i make sure that i finish my homework and chores well before the shows. otherwise i will have to miss them. mostly i manage to watch the shows but sometimes extra homework or chores may cause me to miss a show or two, but it is rare. anyhow if i know that i am definitely not able to catch a show in time, i will just set the video recorder to tape the show sothe evening when the weather is fine, i sometimes go for a stroll around the neighborhood with my friends. this is the time when most the neighbors have come home from work or school. we say hello to those whom we know. they are mostly friendly people and they acknowledge our greetings. once in a while we come upon unfriendly neighbors but we just ignore them and carry on. that i can watch it later.

i would pick a. i think this is more of a personal question though.