In the following passage some of the words have been deleted. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.
The difference between the solar radiation absorbed and the thermal radiation emitted to space (1) _____ radiation budget of the earth. Since there is no appreciable long-term trend in planetary temperature, it may be (2) ______ that this budget is essentially zero on a global long term average.
The rate of temperature change in any region is directly (3) ______ to energy budget of the region and inversely proportional to its heat capacity. While the radiation (4) ______ may dominate the average energy budget of many surfaces, nonradiative energy transfer and storage also are (5) ______ important when local changes are considered.
Select the most appropriate option to fill in blank number 1.

In the following passage some of the words have been deleted. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.
The difference between the solar radiation absorbed and the thermal radiation emitted to space (1) _____ radiation budget of the earth. Since there is no appreciable long-term trend in planetary temperature, it may be (2) ______ that this budget is essentially zero on a global long term average.
The rate of temperature change in any region is directly (3) ______ to energy budget of the region and inversely proportional to its heat capacity. While the radiation (4) ______ may dominate the average energy budget of many surfaces, nonradiative energy transfer and storage also are (5) ______ important when local changes are considered.
Select the most appropriate option to fill in blank number 1.