With Energy [E] on the Horizontal Axis and Land [L] $\Delta$

Multiple Choice

With energy [E] on the horizontal axis and land [L] on the vertical axis,the marginal rate of technical substitution of energy for land (MRTS_EL) equals:

A) MP_L/MP_E
B) - $\Delta$ E/ $\Delta$ L
C) - $\Delta$ Q/ $\Delta$ L
D) (MP_L/ $\Delta$ E) ( $\Delta$ L/MP_E)