Are is correct. An orange, an apple and a pear constitute a plural subject. ] There are/is and it is are called dummy subjects or expletives that fill in for the subject before the verb.
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A.
'There is an orange, an apple and (a) pear' on the plate' to 'There are an orange, (an) apple and (a) pear on the plate.'
Jesperson notes that the invariable singular occurs mostly in the colloquial style -- speech and speechlike prose -- and is generally avoided in the literary style. That observation accords with our evidence. In the more complex constructions, you are best guided by your own sense of wha