Select the most appropriate option to fill in the blank.

He said the cooperative will continue to invest ______ per its usual yearly rate.

as

The most appropriate option to fill in the blank is as.

The sentence is about the cooperative's investment rate. The word "as" is used to introduce a comparison. In this case, the speaker is comparing the cooperative's investment rate to its usual yearly rate.

The other options are not as appropriate.

• That introduces a noun clause. This does not make sense in the context of the sentence because the speaker is not introducing a noun clause.
• So is used to introduce a result. This does not make sense in the context of the sentence because the speaker is not introducing a result.
• Such is used to introduce a noun or pronoun that is similar to something that has already been mentioned. This does not make sense in the context of the sentence because the speaker is not introducing a noun or pronoun that is similar to something that has already been mentioned.