Bonjour
respond to the question using a <u>DIRECT</u> object pronoun
<em>Charles a entendu </em><u><em>sa mère</em></u><em> ?</em>
Oui, Charles l'a entendue.
<em>OR</em>
Non, Charles ne l'a pas entendue.
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The direct object pronoun is l'
It replaces the direct object : "sa mère" => feminine singular noun
fem. sing. pronoun = "la"
"la" changes in l' because the following noun begins with a vowel.<em>(is a vowel = a)</em>
The past participle with "avoir" agrees with the direct object ONLY if this direct object is before the verb.
Charles a entendu sa mère. <em>(the direct object "sa mère" is after the verb.</em>
Charles l'a entendue. <em>(The direct object (pronoun </em><em>l'</em><em>) is before the verb ► the past participle agrees)</em>
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hope this helps ☺☺☺