Question

The amount spent on heating depends on the average temperature

A. Temperature (amount) or T(a)

B. Temperature (heating) or T(h)

C. Heating (temperature) or H(t)

D. Amount (temperature) or A(t)

Answer 1

`\bf \stackrel{\textit{the amount spent on }\stackrel{H(t)}{heating}\textit{ depends on the average }\stackrel{t}{temperature}}{H(t)}`

Answer 2

That's D.

A(t) is the amount as a function of the temperature t.