The correct answer is A. es
Explanation:
In the English language the plural of nouns is usually formed by adding -s to the nouns, for example, the plural of cat is <em>cats</em>, and the plural of house is <em>houses</em>. However, there are cases in which adding only "s" is not correct as the way the plural of nouns is formed also depends on the ending of nouns. In this way according to grammar if the noun ends in <em>sh, s, ch</em> or <em>x</em> such as clash, match, kiss or box, the plural is formed by adding <em>-es</em>, this means the plural forms are clashes, matches, kisses or boxes and this grammatical rule applies to all nouns ending in <em>sh, s, ch</em> or <em>x</em>. Thus, to form the plural of a noun ending in <em>s, sh, ch</em> or <em>x</em> it is necessary to ad <em>-es</em>.