Christina worked diligently to make her grades in high school; was offered several scholarships.
which transition word or phrase best completes the sentence?

-however

-because

-for example

-as a result

The correct answer is D. As a result

Explanation:

A transition word or phrase always connects different elements and explains how these are related, due to this, the transition selected for a phrase should indicate accurately the relationship or link between the elements the transition connects. In the case presented the sentence "she was offered several scholarships" seems to be a consequence or result of "Christina worked diligently to make her grades in high school". According to this, it is necessary to have an effect or consequence transition such as therefore, so, consequently or as a result that is included in the 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.