Correct Option: A

The given figure (i.e., fig)
From figure, for transistor Q₁

gm1 =	ic1
	Vi

and for transistor Q₂

or gm2 =	i0
	Vi

or gm2 =	ie1
	Vi

(Since for common base transistor current gain ≈ 1 i.e. i ₀ = i _e1)
or g_m2 = g_m1
Therefore the transconductance of the cascode amplifier is g_m1.