Answer:
b) remains
Explanation:
"Remains" is the grammatically correct word to occupy the white space shown in the question above.
That's because that word is related to the word "Optimism", which represents the pronoun "it" in that sentence. As we know, when using the pronouns "he, she, it" we must conjugate the verbs. The correct form of "remain" is "remains".
Answer:
Many scholars believe that the collapse of the Indus Valley Civilization was caused by climate change. ... By 1800 BCE, the Indus Valley climate grew cooler and drier, and a tectonic event may have diverted or disrupted river systems, which were the lifelines of the Indus Valley Civilization.
<h3>Answer:</h3><h2>Producers can generate instant sales by using websites.</h2><h3>Explanation:</h3>
A website is a necessary marketing tool -- and every manufacturer practices its site individually. Some practice it to produce instant income through e-commerce deals while others use it to create contacts, phone calls or physical spot talks. There is one idea that every manufacturer wants to achieve with its website: leveraging it to generate more growth.
