The above sentence describes an action that happened in the past, so we use the past simple
steal (v): steal is a verb according to the rules=> review the rule table
=> One London newspaper reported that a 12-year-old boy became so obsessed with various computer games that he stole from his Parents and his schoolmates in order to buy more.
A London newspaper reported that a 12-year-old was so obsessed with various computer games that he stole from his parents and schoolmates to buy more.
The answer to choose is: