Sound is to mute as vision is to
apparitional
dogmatic
austere
obscure

Obscure seems to be the best option here

Explanation:

Since mute means unable to hear, the equivalent for vision would be obscure, which means unknown or hidden, so, unable to see.

we need the speech to be able to answer your question, reply with it and i'll reply with the answer.

a-he encouraged islamic schools to introduce greek texts.

d-he invited greek scholars to teach their texts to the locals.

explanation:

the transmission of the greek classics to latin western europe during the middle ages was a key factor in the development of intellectual life in western europe.[1] interest in greek texts and their availability was scarce in the latin west during the earlier middle ages, but as traffic to the east increased so did western scholarship.

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