Answer:
The Romans constructed aqueducts throughout their Republic and later Empire, to bring water from outside sources into cities and towns. ... Aqueducts moved water through gravity alone, along a slight overall downward gradient within conduits of stone, brick, or concrete; the steeper the gradient, the faster the flow.
The correct option is B. The rule is when one of the nouns connected by 'or' or 'nor' is plural then the verb must be plural and the plural subject should be placed next to the verb. Here, 'Surendra' is singular subject and 'his friends' is plural subject thus 'have been' is used which is plural verb. Hence, 'Have been' is the best fit according to the rule
Hey!
Vincent van Gogh was the one who painted this, he named it "Starry Night". It's an appropriate name due to the stars that can be seen in the sky. Since he was a post-impressionist, that explains why the paint strokes <span>can be seen so small and thin</span><span>. That was very uncommon compared to regular paintings during that time.
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Thanks!
-TetraFish
