Correct option is A
The correct option to fill in the blank is (a) and.
'And' is used to connect words of the same part of speech, clauses, or sentences that are to be taken jointly.
Meanings of other options:
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Also: in addition; too.
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Yet: up until the present or a specified or implied time.
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But: used to introduce a phrase or clause contrasting with what has already been mentioned.