Consider the Following Production Function Y = A×K^a×L^1?a

Consider the following production function Y = A×K^a×L^1?a.
If a = 0.4, and over the past year output grew 4 percent, total factor productivity (TFP) grew 2.6 percent, and labor grew 1 percent, what was the growth rate of capital?

A) 4 percent
B) 3 percent
C) 2 percent
D) 1 percent