Select all the statements that can be mentioned as a possible reason why there was an increase or decrease $($movement$)$ in the year$-$on$-$year Gross Profit Ratio of a South African retail company that also has international customers and suppliers?

$(1)$ Goods might have been sold to overseas customers in foreign currency and the Rand has strengthened.

$(2)$ The Rand might have weakened leading to higher cost of foreign purchases.

$(3)$ The suppliers might have increased their prices and the company was not able to pass this increase to their customers due to competition.

$(4)$ The company might have reduced the selling price to clear old stock.

$(5)$ The company might have done bulk purchases to qualify for bulk discount or not, revealing either good or poor stock management.

$($a$)$ Statements $(1),(2)$ and $(3)$

$($b$)$ Statements $(1),(2),(3)$ and $(4)$

$($c$)$ Statements $(1),(3),(4)$ and $(5)$

$($d$)$ Statements $(1),(2),(3),(4)$ and $(5)$

Select one:

a$.$

Statements $(1),(2),(3),(4)$ and $(5)$

b$.$

Statements $(1),(2),(3)$ and $(4)$

c$.$

Statements $(1),(2)$ and $(3)$

d$.$

Statements $(1),(3),(4)$ and $(5)$