Ignoring any premium paid on acquisition, which acquisition should the directors pursue?

Company Z has identified four potential acquisition targets: companies A, B, C and D.

Company Z has a current equity market value of $580 million.

The price it would have to pay for the equity of each company is as follows:

Only one of the target companies can be acquired and the consideration will be paid in cash.

The following estimations of the new combined value of Company Z have been prepared for each acquisition before deduction of the cash consideration:

Ignoring any premium paid on acquisition, which acquisition should the directors pursue?
A . A
B . B
C . C
D . D