Galileo did not invent the telescope, but on hearing, in 1609, that such an optical instrument had been made, he quickly built his own device from an organ pipe and spectacle lenses.
A. Galileo did not invent the telescope, but on hearing, in 1609, that such an optical instrument had been made, he
B. Galileo had not invented the telescope, but when he heard, in 1609, of such an optical instrument having been made,
C. Galileo, even though he had not invented the telescope, on hearing, in 1609, that such an optical instrument had been made, he
D. Even though Galileo did not invent the telescope, on hearing, in 1609, that such an optical instrument had been made,
E. Even though Galileo did not invent the telescope, but when he heard, in 1609, of such an optical instrument being made, he

[spoiler]In a forum I read that one of the reason why the right answer is not B is that "having been made" is not in the right tense.
I wanted to know if the following could be a right answer:
Galileo did not invent the telescope, but when he heard, in 1609, such an optical instrument being made,he
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