The two things a clause needed to considered a clause is a subject and verb.
The answer for the given question above would be the last option. The line that best explains what the speaker gains from nature based on the poem "Summer" is g<span>athering strength for efforts yet to come. Hope this answers your question. </span>
It is most likely C, I hope this helps you!!
C. The witches' prophecy about macbeths future
