$(5$ pts $)18.$ An object with mass $3\mathrm{.}00$ kg is held in place by two light ropes, as shown in the sketch. What is the tension $T_1^n$

$($a$)25$ N

$($b$)39$ N

$($c$)42$ N

$($d$)49$ N

$($e$)56$ N

$($f$)$ none of the above answers