The sentence that contains an unnecessary shift in verb tense is the second one - Lee noticed a problem and alerts a teacher.
It should be <em>alerted, </em>which is the past tense as the first verb <em>noticed.</em>
Yes i have read it but why you want to know
A celebration of Native Americans returning to their old ways of life. ... What does the Grand Coulee Dam represent to Native Americans? It represent great change on their way of life. The dam blocks the river which is causing negative effects on the salmon population.
Hope this helps.
I think A. Otherwise you would have to wait some time for an answer to be written down.
