The answer is:
The animals <em><u>scrambled </u></em>to get into the barn as the lightning <em><u>struck</u></em>.
In the chosen sentence, both verbs in the different clauses are consistent ad accurate because they are written in the Past Simple tense.
The rest of the options are incorrect because the tense of the verbs is not related to each other: they wrongly combine past and present, and present and future tenses.
The right version of them are the following:
<em>Alexander </em><em>finished </em><em>his math test and </em><em>walked </em><em>to Mr. Smith's desk.
</em>
<em>
Sampson and Raina </em><em>watch </em><em>the fireworks and </em><em>comment </em><em>on how beautiful they are.
</em>
<em>
The police officer </em><em>rounded </em><em>the corner and pumped his arms harder.</em>
DISpose. Definition:<span>get rid of by throwing away or giving or selling to someone else.
</span>
Answer:
A
Explanation:
In A, your 1st clause is an incomplete sentence which would not make any sense without the presence of 2nd clause; thus making it DEPENDENT on the 2nd clause.