Question

Select the demonstrative adjective that correctly completes this sentence. _______ niño en la foto es mi primo Francisco. A. Estos B. Esa C. Esta D. Este

Answer 1

The correct answer is:  [D]:  "Este" .
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 "niño" is a single, masculine noun; as such, "Este" is the correct answer choice.
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Answer 2

The correct demonstrative adjective for this sentences would be "este".
* Este niño en la foto es mi primo Francisco". Because "ESTE" refers to a singular male subject. If it would have been a girl, the correct option would have been "ESTA". For plurals we need to use "estos" and "esa" when it is a singular, female and we point the subject at a certain distance. "Esa es mi prima" -->  That is my cousin (over there)