The answer to your question is ‘no’
. Both the phrases “demand for”
and “demand in”
. Their usage entirely depends on the context of the sentence
as to what the sentence wants to communicate. Let’s take a few simple examples to understand the usage of these phrases.
1. Famine increases the demand for food supplies in the affected area.
Here, the use of “demand for” is correct because the sentence conveys the meaning that when famine takes place, it increases the demand for food supplies. So here we ask ourselves whose demand increases? The answer is of “food supplies”. Hence we say “demand for food supply”.
2. Oil demand in developed country probably peaked in 2005.
In this sentence “demand in” talks about the place where the demand for oil increased. When we say “demand in”, we need to mention the sphere where the demand for an entity has been affected.
Now let’s examine the sentence in question.Because of less availability and greater demand for scientific research, platinum remains consistently expensive, like gold.
In this sentence, when we say “demand for scientific research”, it means that demand for scientific research has been increased. This is not the intended meaning of the sentence. The intended meaning is that demand for platinum has increased. In what sphere? In the sphere of scientific research. Hence, the correct phrase that should be used in this subject is “demand in” and not “demand for”.
Answer choices C and E correct that error. However, choice E remains incorrect because there is no referent for “that of”. There is nothing in the sentence that “that for” can stand for. Hence choice C
is the correct answer.
Hope this helps.
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