SC: Because of less availability and greater demand

[NMencia09]

Because of less availability and greater demand for scientific research, platinum remains consistently expensive, like gold.

Because of less availability and greater demand for scientific research, platinum remains consistently expensive, like gold.

Because of less availability and increased demand for scientific research, platinum remains consistently expensive, like that of gold.

Because of decreased availability and increased demand in scientific research, platinum remains expensive, like gold.

Because of decreased availability and increased demand for scientific research, platinum remains expensive, like gold.

Because of decreased availability and greater demand in scientific research, platinum remains at a consistently high price, like that of gold.

OA: C.
Can someone explain why D is wrong? WHy not demand for, vs demand in? WHen do you know to use "for" and when to use "in"?

[jnelson0612]

Please see this thread: post3884.html :-)