Superdense coding

Which of the following unitaries prepares the following Bell state?

$\frac{|00\rangle+|11\rangle}{\sqrt{2}}$
G_i denotes gate G applied to qubit i, and CNOT_ij denotes a CNOT gate with control qubit i and target qubit j.

$A): H_2 CNOT_{12},\quad B): H_1 CNOT_{21},\quad C): H_1 CNOT_{12},\quad D): H_1 H_2 CNOT_{12}$

The answer is C).

What state do you get if you apply the Bell preparation circuit to the state |11>?

$\frac{|01\rangle-|10\rangle}{\sqrt{2}}$

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Superdense coding