 
 <translate> 7a/30 tells us that a is a factor of 30, which has 2, 3, and 5 as its prime factors. Each of them is distinct. Moreover, all multiples of 30 less than 200 can be derived by multiplying these prime factors alone. Thus, number of different prime factors is 3.
Thus, the answer is (B). <ibo> 7a/30 na-agwa anyị na a bụ onye na-eme 30, nke nwere 2, 3 na 5 dị ka ndị isi ya. Nke ọ bụla n'ime ha dị iche. Ọzọkwa, a pụrụ inweta ọtụtụ nke 30 nke na-erughị 200 site n'ịmụba nanị ndị isi ihe ndị a. N'ihi ya, ọnụọgụgụ nke isi ihe dị iche iche bụ 3. N'ihi ya, azịza ya bụ (B). 