<p>the OP is correct about the first one… the error is a tense error, not a singular/plural agreement error. Data could be either singular OR plural, but because the sentence starts “to this day,” the present tense “tells” wouldn’t work.</p>
<p>the OP is correct about the first one… the error is a tense error, not a singular/plural agreement error. Data could be either singular OR plural, but because the sentence starts “to this day,” the present tense “tells” wouldn’t work.</p>